CST4 GI:4503109 cystatin S precursor 1 marplctlll lmatlagala ssskeenrii pggiydadln dewvqralhf 50 51 aiseynkate deyyrrplqv lrareqtfgg vnyffdvevg rtictksqpn 100 101 ldtcafheqp elqkkqlcsf eiyevpwedr mslvnsrcqe a