Fig. 7. Linear regression analysis of PGC numbers versus somite numbers in embryos from Blimp1 heterozygous intercrosses. Combined PGC counts from prdm1^BEH/+ and prdm1^BAH/+ (C57BL/6x129/Sv//Ev) intercrosses. The values in the regression equation y=a+bx, for log PGC number (y) and somite number (x) were a=1.603 and b=0.0587, and a=0.9324 and b=0.0842, for wild type and Blimp1 heterozygotes, respectively. The variances between PGC number and somite number are not significantly different according to the F test (F=2.2x10^-22 and F=5.4x10^-23 for wild type and heterozygotes, respectively).