Differential expression of STE13ca gene in C. albicans ATCC 10231 during different growth phases, nitrogen sources and during dimorphism using RT-PCR. (a) Digital imagery of cellular morphology, (b) cDNA STE13ca gene, (c) 18S rDNA cDNA, and (d) STE13ca gene expression. (d)-I Growth phases in YEPD: (1) logarithmic, 6 h; (2) early stationary, 12 h; (3) late stationary, 24 h. (d)-II Incubation for 12 h in YNB medium with different nitrogen sources: (4) YNB, (5) YNB–proline, (6) YNB–NH₂, (7) YNB–peptone. (d)-III Dimorphism in Lee's medium: (8) phase G1, (9–10) germinal tube formation, (11–12) pseudomycelium formation, (13) mycelium formation. The intensity of bands STE13ca cDNA was normalized to the intensity of 18S rDNA cDNA.