during the period from 30 to 90 min following the administration of cocaine to pregnant dams , cocaine appeared in fetal brain at a rate of 50-90 % of the concentration in the dam 's brain ( presumably because of the lower lipid content in fetal brain compared to adult ) , but still at a rate of 109-151 % of the concentration in the dam 's blood .
C0006104
brain
C0086045
concentration