A new mouse mutant with cleavage-resistant versican and isoform-specific versican mutants demonstrate that proteolysis at the Glu441-Ala442 peptide bond in the V1 isoform is essential for interdigital web regression. - Nandadasa S; Burin des Roziers C; Koch C; Tran-Lundmark K; Dours-Zimmermann MT; Zimmermann DR; Valleix S; Apte SS (Matrix biology plus, 2021)