CYS1 GI:81158080 cystin 1 1 mgsgssrssr tlrrrrspes lpagpgaaal eggtrrrvpv aaaevpgaaa 50 51 eeapgrdpsp vappdgrdet lrlldellae saawgppepa prrparlrpt 100 101 avagsavcae qsteghpgsg nvseapgsgr kkperpaais ydhseeglma 150 151 siereycr