Decreased femoral marrow cellularity, but no change in proliferative activity and differential counts in chemically sympathectomized mice. The mice were killed 2 hours after Bacto-Tryptone injection. *P = .002. (For these data pooled with data from another series of experiments [17 + 19 cyclophosphamide-treated mice], P < .0001). Median values with their 95% confidence intervals and the number of mice examined (top columns) are given.