Kinetics of bone marrow transplantation with nm/nm and ?/+ donors. Irradiated C57BL/6J-Igh^a Thy1^a Gpi1^a +/+ animals that had received C57BL/6J-Igh^b Thy1^b Gpi1^b ?/+ (n = 6) or nm/nm (n = 5) fetal liver cells were serially monitored for RBC chimerism by Gpi1 isozyme analysis and blood parameters. The decrease in MCV closely follows engraftment by nm/nm cells. Error bars indicate plus or minus 1 standard deviation (SD).