MCF10A growth and morphology is dictated by matrix additions. (a) Box plots (n = 6) showing bulk oscillatory rheology of 10 mg/mL peptide gels with matrix modifications, (b) immunostaining of collagen I and HA distribution in the modified 10 mg/mL peptide gels seeded with MCF10A (DAPI, blue, scale bar 50 μm), (c) acinar morphology in modified 10 mg/mL gels at day 14 (scale bar 100 μm), (d) single cell acinus formed in 20% Matrigel™ at day 14 (scale bar 50 μm (left), 25 μm (right)). *indicates p < 0.05 (one-way ANOVA). (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)