= Marina Serna
{c}
<Marina Serna> is a researcher in <structural biology> whose work includes <cryo-electron microscopy> of large <protein complexes>. She was first author of the 2016 study determining the architecture of the <complement system>'s <membrane attack complex>.<Structural basis of complement membrane attack complex formation by Marina Serna and others>[Original author list; Results, Cryo-EM structure of the MAC]{ref}
The experiment linked function to structure. The researchers assembled complexes on <liposomes>, checked release of a fluorescent marker to establish functional pores, then isolated the complexes for frozen-hydrated imaging. The reconstruction identified eighteen copies of <complement C9> in the analyzed completed pore.<Structural basis of complement membrane attack complex formation by Marina Serna and others>[Results, Cryo-EM structure of the MAC and Molecular architecture; Figure 1]{ref}
A constructed fluorescence example explains why assay controls matter. Suppose a no-release control gives signal $F_0=10$, a sample gives $F=40$, and a complete-release reference gives $F_{\max}=110$, all in compatible instrument units. A normalized release readout would be
$$
R=\frac{F-F_0}{F_{\max}-F_0}=\frac{30}{100}=0.30.
$$
This is an invented linear-calibration example, not the paper's measured values. The raw sample signal is forty units, but the estimated fraction is thirty percent because the background and reference determine the denominator.
The functional check and structural reconstruction answer different questions. Marker release tests whether a preparation makes membranes permeable; the reconstructed density constrains the architecture of selected complexes. Eighteen C9 copies in the studied end product do not establish that eighteen are a universal minimum for membrane damage.<Structural basis of complement membrane attack complex formation by Marina Serna and others>[Results, completed-pore stoichiometry distinguished from lysis by fewer C9 molecules]{ref}
\Image[https://www.cnio.es/wp-content/uploads/2024/09/marina-serna-esanchez-1-scaled.jpg]
{title=Marina Serna}
{description=Portrait by Esther Sánchez / CNIO, explicitly identified in the institutional research profile: https://www.cnio.es/en/news/cnio-researcher-marina-serna-awarded-for-her-contribution-to-solving-a-crucial-biological-problem-2/ .}
{height=300}
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