Postnatal growth (mean weight ±SEM) of BALB/c +/+ (○) and Rag2 −/−/Il2rg−/− (●) from birth to 16 wks of age. All Rag2 −/−/Il2rg−/− data are from our Queen’s University laboratory with 6–9 animals weighed/time point. BALB/c+/+ data are from mixed sources. BALB/c birth weights were published by Pal et al., (n=9)34 and Buzas et al., (n=11)35. Data for BALB/c growth to 8 wks of age (#) are from the Jackson Laboratory Mouse Phenome Database (n=40; www.jax.org). Data for BALB/c+/+ growth after 8 wks is from our Queen’s University laboratory. Because husbandry and diet may influence weight measurements, statistics are not presented for measures made before wk 10, which was 2 wk after receipt and conditioning of BALB/c +/+ at our colony. For both genotypes, data collected before weaning (<4 wk), include both sexes. Wk 4–16 data are for females only. *P<0.01 compared with BALB/c+/+ females.