Figure 1.

Pregnyl human chorionic gonadotropin (hCG) affects Sw.71 trophoblast cell viability at concentrations higher than 100 IU. A, Sw.71 cells were plated in triplicate and viability was determined 24, 48, and 72 hours post-hCG treatment at concentrations ranging between 2.5 and 500 IU. B, Sw.71 cell growth was further analyzed by measuring cell confluence for 60 hours post-hCG treatment at concentrations ranging between 25 and 1000 IU. Concentrations of hCG less than or equal to 100 IU did not affect viability and cells reached confluence 28 hours posttreatment, similar to cells that received no treatment.