RNA isolated from cells treated with vehicle (Con) or 100 nM 1,25D for 24 h was analyzed with primers specific for SLC1A6, SLC1A2, SLC1A3, SLC1A7 and SLC7A11. Data were normalized to 18S and expressed relative to control values which were set to 1. Each bar represents mean ± SD of three independent biological replicates analyzed in duplicate. *p <0.05 as measured by one-tailed, unpaired student t-test.