whereas 3.75 x 10 ( -9 ) mole isoproterenol in 5 microliter saline solution induced aortic arch anomalies in 39 % of embryos injected at hamburger-hamilton developmental stage 26 , pretreatment with practolol one to two minutes before catecholamine administration reduced the anomaly rate to to 4 % .
C0022245
isoproterenol
C0007412
catecholamine