Influence of hCG on parasite growth in vitro with parasitaemia determined by microscopy. A). Geometric mean parasitaemia ± SE for NF54-3D7 parasites cultured with hCG from Calbiochem (3 experiments), Cell Sciences, Inc. (2 exp't) and Sigma Aldrich (1 exp't); results from triplicate cultures were averaged and then the means for each of the 6 expt. were averaged. B) FVO parasites were cultured with hCG from Calbiochem (1 exp't) and Cell Sciences (1 exp't.); results from triplicate wells were averaged and then the means from each experiment were averaged. The * indicates starting parasitaemia.