Figure 4. mtDNA copy number in single cells of 7.5 and 13.5 dpc mouse embryos (logarithmic scale).

Open black circles, primordial germ cells (PGCs); Open grey circles, somatic cells. Each circle represents a single cell. Horizontal lines indicate mean values. EB, early bud stage. LB, late bud stage. F, M, and Soma denote samples from female PGCs, male PGCs, and gonadal somatic cells, respectively.