CCL-9 and CCR1 mRNA expression in long bones determined by microarray and real-time PCR.tl rats were treated for the days indicated and total bone RNA was analyzed. CCL9 and CCR1 mRNA were highest after 2 days of treatment, after which the levels subsided. Means + 1 SD are shown. Compared with untreated animals (day 0), all time points were significantly elevated. (A-B) *Difference from day 0, P < .01. (C) *Difference from day 0, P < .005; **P < .02.