in contrast , the precursor deduced from porcine cdna coding et-21 ( pet-39 ) had 100-fold less contractile activity in vitro ( ec50 = 3.26 x 10 ( -8 ) m ) , and so did the precursor from human cdna ( het-38 ) ( ec50 = 1.48 x 10 ( -8 ) m ) .
C0086418
human
C0898753
het