Phenotypic characterization of hematopoiesis in TIMP-1^−/− mice. (A) Lineage distribution of Mac-1⁺ myeloid cells, B220⁺ B lymphocytes, and CD4⁺CD8⁺ T lymphocytes in the BM, PB, and spleen of WT and TIMP-1^−/− mice, as assessed by flow cytometry. (B) BM cellularity (absolute numbers) per mouse. Cells were harvested from both tibias, femurs, and hips. Results are reported as mean ± SEM.