CST11 GI:18644732 cystatin 11 isoform 2 precursor 1 mmaepwqalq lllailltlm alpyqarkkt flsvhevmav enyakdslqw 50 51 itdqynkesd dkyhfrifrv lkvqrqqvnc ffsvfavpwf eqykilnksc 100 101 ssd