Fig. 3.

Proliferative responses of mononuclear cells from fetuses, neonates and adults. Mononuclear cells (2 × 10⁵ cells/well) from a fetus (Fetal), a term newborn (Cord), delivered by caesarean section, a pregnant woman (PW) and an unrelated male adult (Men) were cultured in the presence (▪), or absence (□), of PHA on 96-well plates for 72 h. ³H-TdR was added to the cultures for the last 8 h of the incubation before harvesting. The results are expressed as ³H-TdR incorporation (CPM). This is a representative of 5 experiments using blood samples from different subjects. Four out of the 5 neonates were delivered by elective caesarean section.