Hematologic analysis and data.

(A) Photomicrographs of 14.5-day fetal blood from a WT control (i), 14.5-day fetal blood from a floxed homozygote with marked dyserythropoiesis and an increased portion of yolk sac erythroid cells (ii), peripheral blood from a normal adult (iii), and peripheral blood from a KO adult with essentially normal red cell morphologic features (iv). Original magnifications × 400 (i and ii) and × 1000 (iii and iv). (B) Hb, MCV, and MCH data for the various HS −26 genotypes compared with age-matched control mice.