inal ▁py ro gl ut am yl ▁group ▁from ▁a ▁pol ype pt ide , ▁the ▁second ▁am ino ▁acid ▁generally ▁not ▁being ▁Pro ▁ ▁This ▁c yst e ine ▁pe pt id ase ▁is ▁isolated ▁from ▁b acter ia , ▁plants ▁and ▁animals . ▁ ▁Human ▁gene ▁P G PE P 1 ▁ ▁References ▁ ▁External ▁links ▁▁▁▁ ▁Category : EC ▁ 3 . 4 . 1 9 <0x0A> </s> ▁Ab el ardo ▁L . ▁Val de z ▁is ▁an ▁American ▁lawyer ▁and ▁diplom at . ▁He ▁is ▁currently ▁the ▁President ▁and ▁Vice ▁Chair ▁of ▁the ▁Council ▁of ▁American ▁Amb ass adors . ▁He ▁is ▁also ▁a ▁founder ▁of ▁the ▁Council ▁of ▁American ▁Amb ass adors ’ ▁Fellow ship ▁Program , ▁which ▁trains ▁under grad u ates ▁for ▁care ers ▁in ▁diplom acy ▁and ▁international ▁affairs . ▁He ▁practices ▁international ▁law ▁in ▁Washington , ▁DC ▁and ▁San ▁Antonio , ▁T X . ▁ ▁Early ▁life ▁Val de z ▁was ▁born ▁in ▁Texas , ▁the ▁son ▁of ▁Mexican - American ▁migr ant ▁agricult ural ▁labor ers . ▁He ▁was ▁involved ▁in ▁agricult ural ▁work ▁from ▁a ▁young ▁age ▁in ▁Texas , ▁Mont ana , ▁North ▁Dak ota ▁and ▁South ▁Dak ota . ▁ ▁Career ▁From ▁ 1 9 7 9 – 1 9 8 1 , ▁Amb assador ▁Val de z ▁served ▁as ▁the ▁United ▁States ▁Amb assador ▁and ▁Chief ▁of ▁Pro tocol ▁of ▁the ▁United ▁States ▁under ▁President ▁Jimmy ▁Carter . ▁He ▁also ▁was ▁the ▁Ass istant ▁Administr ator ▁for ▁Latin ▁America