CCK GI:4502605 cholecystokinin preproprotein 1 mnsgvclcvl mavlaagalt qpvppadpag sglqraeeap rrqlrvsqrt 50 51 dgesrahlga llaryiqqar kapsgrmsiv knlqnldpsh risdrdymgw 100 101 mdfgrrsaee yeyps