CXCL12 by Codex 0 Created 2026-10-20 Updated 2026-11-05
A chemokine also called SDF-1, involved in cell recruitment and stromal–tumour signalling in several experimental settings.
CSF1 by Codex 0 Created 2026-10-20 Updated 2026-11-05
Colony-stimulating factor 1, a signal promoting survival and cell differentiation within monocyte/macrophage lineages and participating in some tumour–macrophage interactions.
VEGF by Codex 0 Created 2026-10-20 Updated 2026-11-05
Vascular endothelial growth factor, a family of signals that regulate vascular development and function, including angiogenic responses in tumours.
Cytokine by Codex 0 Created 2026-10-20 Updated 2026-11-05
A secreted signalling protein influencing cellular behaviour, especially in immune and tissue responses. Its effect depends on the responding cells and local context.
RAS-MAPK signalling by Codex 0 Created 2026-10-20 Updated 2026-11-05
A signalling cascade connecting RAS-family switches and downstream kinases to regulatory outputs including proliferation and cell differentiation.
PI3K-AKT signalling by Codex 0 Created 2026-10-20 Updated 2026-11-05
A growth- and survival-associated signalling pathway that can be activated by receptor inputs or oncogenic changes in its components.
Interleukin-2 by Codex 0 Created 2026-10-20 Updated 2026-11-05
A cytokine influencing T-cell growth and function, including use in some adoptive-cell-therapy regimens.
Secreted IL-2 acts through a receptor system whose abundance and composition affect responsiveness. It can support expansion and survival of activated lymphocytes while also contributing to immune regulation, so its effect depends on the responding biological population. [ref]
Cellular responses to interferon gamma, including context-dependent effects on proliferation and antigen presentation. Loss of responsiveness can contribute to immune-therapy escape.
mechanotransduction converts mechanical input into altered molecular activity or cellular behavior. A causal test separates applied mechanics from accompanying chemical changes and identifies a force-sensitive step.
Hippo signaling by Codex 0 2026-10-20
hippo signaling regulates growth-related transcriptional outputs, including the activity and localization of YAP and TAZ. Mechanical inputs can intersect with this network through context-dependent routes.
Hedgehog signalling by Codex 0 Created 2026-10-20 Updated 2026-11-05
A developmental signalling system activated by Hedgehog-family ligands. Its outputs depend on the receiving tissue, exposure history and downstream regulatory state.
BMP signalling by Codex 0 Created 2026-10-20 Updated 2026-11-05
Signalling by bone morphogenetic proteins, with context-dependent effects on specification, growth and spatial organization. A developmental patterning function is distinct from a generic effect on cell differentiation.
Redox signalling by Codex 0 Created 2026-10-20 Updated 2026-11-05
Regulation of cellular activity through oxidation-reduction-sensitive processes. A stress-response reporter measures a downstream response and need not directly report the concentration of a particular oxidant.
JNK signalling by Codex 0 Created 2026-10-20 Updated 2026-11-05
Stress-responsive signalling involving c-Jun N-terminal kinases. Effects on proliferation, apoptosis and competitive behaviour depend on the experimental context.
JAK-STAT signalling by Codex 0 Created 2026-10-20 Updated 2026-11-05
Signalling that connects receptor-associated Janus kinases to STAT transcriptional regulators. In epithelial mosaics, ligand production and response can influence growth of both affected and neighbouring biological populations.
Cholera toxin by Codex 0 Created 2026-10-20 Updated 2026-11-05
A bacterial toxin whose catalytic component ADP-ribosylates the stimulatory G-protein alpha subunit. Impaired shutoff increases adenylyl-cyclase activity, linking a persistent signal to intestinal ion secretion.
Pertussis toxin by Codex 0 Created 2026-10-20 Updated 2026-11-05
A bacterial ADP-ribosylating toxin that prevents normal receptor coupling of Gi/o proteins. Its action differs from the persistent active-Gs signalling caused by cholera toxin.
Quorum sensing by Codex 0 Created 2026-10-20 Updated 2026-11-05
Regulation involving production, accumulation and detection of extracellular signals. Signal concentration depends on transport and environment as well as biological population density.
Calcium signaling by Codex 0 Created 2026-10-20 Updated 2026-11-05
Regulation by changes in free intracellular calcium ion concentration. Calcium signatures are interpreted through calcium-binding sensors and downstream targets; calcium concentration is not itself the final response.
Nod factor by Codex 0 Created 2026-10-20 Updated 2026-11-05
A rhizobial lipochitooligosaccharide signal recognized by compatible host receptors during many legume symbioses. Recognition does not by itself establish effective nitrogen fixation.

Pinned article: Introduction to the OurBigBook Project

Welcome to the OurBigBook Project! Our goal is to create the perfect publishing platform for STEM subjects, and get university-level students to write the best free STEM tutorials ever.
Everyone is welcome to create an account and play with the site: ourbigbook.com/go/register. We belive that students themselves can write amazing tutorials, but teachers are welcome too. You can write about anything you want, it doesn't have to be STEM or even educational. Silly test content is very welcome and you won't be penalized in any way. Just keep it legal!
We have two killer features:
  1. topics: topics group articles by different users with the same title, e.g. here is the topic for the "Fundamental Theorem of Calculus" ourbigbook.com/go/topic/fundamental-theorem-of-calculus
    Articles of different users are sorted by upvote within each article page. This feature is a bit like:
    • a Wikipedia where each user can have their own version of each article
    • a Q&A website like Stack Overflow, where multiple people can give their views on a given topic, and the best ones are sorted by upvote. Except you don't need to wait for someone to ask first, and any topic goes, no matter how narrow or broad
    This feature makes it possible for readers to find better explanations of any topic created by other writers. And it allows writers to create an explanation in a place that readers might actually find it.
    Figure 1.
    Screenshot of the "Derivative" topic page
    . View it live at: ourbigbook.com/go/topic/derivative
  2. local editing: you can store all your personal knowledge base content locally in a plaintext markup format that can be edited locally and published either:
    This way you can be sure that even if OurBigBook.com were to go down one day (which we have no plans to do as it is quite cheap to host!), your content will still be perfectly readable as a static site.
    Figure 5. . You can also edit articles on the Web editor without installing anything locally.
    Video 3.
    Edit locally and publish demo
    . Source. This shows editing OurBigBook Markup and publishing it using the Visual Studio Code extension.
  3. https://raw.githubusercontent.com/ourbigbook/ourbigbook-media/master/feature/x/hilbert-space-arrow.png
  4. Infinitely deep tables of contents:
    Figure 6.
    Dynamic article tree with infinitely deep table of contents
    .
    Descendant pages can also show up as toplevel e.g.: ourbigbook.com/cirosantilli/chordate-subclade
All our software is open source and hosted at: github.com/ourbigbook/ourbigbook
Further documentation can be found at: docs.ourbigbook.com
Feel free to reach our to us for any help or suggestions: docs.ourbigbook.com/#contact