Peripheral blood absolute neutrophil counts. At age 3 days, 8 to 15 mice per genotype were assayed on 5 separate days; at age 14 days, 6 to 8 mice on 1 day; at age 8 weeks, 8 to 14 mice on 3 days; at age 11 weeks, 8 to 12 mice on 3 days; at age 20 weeks, 14 to 24 mice on 3 days; and at age 30 weeks, 8 to 14 mice on 3 days. The columns labeled 12-18 Mo comprised results from 7 to 9 mice per genotype ranging from 13 to 18 months of age analyzed on 2 separate days. The gender of animals studied at ≤14 days of age could not be determined by external examination, and all older mice studied were male. Results were pooled and are shown as the mean ± 1 SD. All comparisons are between mice of a given age cohort. *P < .05 v wild-type; #P < .05, G−/− v G−/−GM−/−.