chorionic villi obtained during the first trimester from a pregnancy at risk for krabbe 's disease were shown to have reduced cerebroside-beta-galactosidase ( e.c.3.2.1.46 ) activity using the artificial substrate trinitrophenylaminolauryl galactocerebroside ( tnpal-galactocerebroside ) .
C0032979
first trimester
C0032961
pregnancy