Herbst A, Taft P D, Robboy S J
Am J Obstet Gynecol. 1976 Apr 1;124(7):761-3. doi: 10.1016/s0002-9378(16)33350-6.
Amniotic fluid cells obtained after the ninetieth day of gestation in the macaque were analyzed for nuclear chromatin. The technique proved reliable for the prediction of fetal sex.