Fig. 6From: Block-based characterization of protease specificity from substrate sequence profileCleavage site sequence logos and the prominent B2 blocks of proteases. a The sequence logos of caspase 3, kexin, furin and PCSK6 peptidase, which have obvious specificity at the site P1. b The sequence logos of HIV-1 retropepsin, MMP 2 and MMP 9, which have multiple preferences at sites P1 and P2 Back to article page