CST1 GI:19882251 cystatin SN precursor 1 maqylstlll llatlavala wspkeedrii pggiynadln dewvqralhf 50 51 aiseynkatk ddyyrrplrv lrarqqtvgg vnyffdvevg rtictksqpn 100 101 ldtcafheqp elqkkqlcsf eiyevpwenr rslvksrcqe s