TGFB1 and Familial prostate cancer: Peptide 5a, but not 2a, inhibited the adhesion of TRAMP-C2 prostate cancer cells (αvβ6- and αvβ8+) to a neutralizing anti-αvβ8 antibody (Fig. 1A), whereas it promoted cell-adhesion when adsorbed onto the solid-phase (Figure 1B and C); furthermore 5a, but not 2a, inhibited the capability of these cells to activate TGFβ (Figure 1D).