A, Evaluation of amastigote transformation dynamics of parasite morphology and cell viability in samples stained with trypan blue. B, reverse transcription polymerase chain reaction analysis of expression of A2 amastigote-specific protein in axenic Leishmania infantum chagasi amastigotes. a, A2 primer; b, α-tubulin primer. Lanes 1–4 = axenic amastigotes 24, 48, 72, and 96 hours post in vitro incubation, respectively; lane 5 = cultivated promastigotes; lane 6 = negative control. The dataset represent the analysis of two independent experiments. bp = basepairs. Error bars indicate mean ± SD.