https://api.elsevier.com/content/article/pii/S0141813021005596doi:10.1016/j.ijbiomac.2021.03.0421-s2.0-S014181302100559610.1016/j.ijbiomac.2021.03.042S0141-8130(21)00559-6Structural leitmotif and functional variations of the structural catalytic core in (chymo)trypsin-like serine/cysteine fold proteinases International Journal of Biological MacromoleculesJournal014181302021-05-1515 May 20210falsefalse