Fig 1: PA/KN hydrogel combinations and material analysis.(A) Table of PA sequences and proteins used in this study including the chemical formula, molecular weight (MW), concentration used, and zeta potential at pH 7.5 (*in HEPES (pH 7.5), **in water, ***relative to keratin volume, +theoretical). (B) Immunohistochemical (IHC) staining for keratin type I (KRT32) and type II (KRT82) in normal (healthy) ovary and ovarian cancer tissue samples, with IHC controls in fig. S2. (C) TEM image of self-assembled PA fibers (PA-VH) in HEPES [0.1 mg/ml (pH 7.5)]. (D) TEM image of PA fibers interacting with KN (PA-VH/KN). Pure solutions of PA-VH and KN in HEPES [0.1 mg/ml (pH 7.5)] were mixed in ratio 1:1 before analysis. (E) Photograph of a PA-H/KN hydrogel after 14 days in culture medium at 37°C and a representative scanning electron microscopy image of the internal heterogeneous nanofibrous structure of PA/KN hydrogels. (F) Rheological characterization of the hydrogels, measuring the storage modulus (G') and loss modulus (G?) of PA-H/KN and PA-VH/KN hydrogels (mean ± SEM). (G) Graphical plot of the hydrogel mass (Mt/M0) against time, indicating the slow degradation of PA-H/KN and PA-VH/KN hydrogels in PBS 1× at 37°C (mean ± SEM). Photo credit: Clara Hedegaard, Queen Mary University of London. ns, not significant.