Population
Amino acid sequences of trypsin, cathepsin H, and poliovirus proteinase 3C
Design
Other
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May link serine and cysteine proteases via viral evolution; leaves open phylogenetic confirmation and functional implications.
The viral enzyme poliovirus proteinase 3C may provide an evolutionary link between serine and cysteine protease families.
Gorbalenya et al. (1986) studied this question.
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