Philip Hodge and Abdel Chakiri, DOI 10.1039/C5PY00272A. Primary accepted manuscript: pubs.rsc.org/en/content/getauthorversionpdf/c5py00272a . Its first manuscript page gives both authors, the Manchester affiliation and the Abstract: macrocyclic olefins from deoxycholic acid underwent entropically driven ring-opening metathesis polymerization to functionalized polymers. Transparent films are reported; suitability for supporting cell growth is a proposed use, not a demonstrated clinical result.