Weekly nonadherent cell production by LTBMCs in Dexter's culture condition (a) and in Whitlock-Witte's culture condition (b) from BM cells of TN-C–deficient mutant mice (□) and of control mice (▪) obtained at 7 weeks of age. In Dexter's culture condition, hematopoietic foci formation and cell production became active 1 week after culturing, and in Whitlock-Witte's culture condition, active hematopoiesis began 4 weeks after the crisis phase.39Results represented as mean ± SD of nonadherent cells produced weekly by at least six cultures per group per week. Results were significantly different between TN-deficient mouse group and controls (P < .01) in both culture systems. Two other identical experiments gave comparable results.