Gonadotropin stimulation of Kitl expression in mouse ovaries. Gonadotropin regulation of Kitl (A) and c-kit (B) transcripts in ovaries. Line graphs represent DNA microarray data depicting the expression intensity of each transcript (right y axis), whereas bar graphs depict quantitative real-time RT-PCR results (left y axis; mean ± SEM, n = 4). Values of expression intensity were derived from integration of hybridization signals from multiple probe sets for individual genes. Data were normalized based on histone H2a transcript levels. *, P < 0.05 vs. 0 h of PMSG treatment.