Figure 3 of Oka, Mol Vis 2010; 16:945-953.

Figure 3. Age-dependent changes in the percentage of side population (SP) cells in the lens epithelium. The percentage of SP cells was measured at embryonic day 15 (E15), E17, postnatal day 1 (PN1), PN3, PN5, PN7, PN14, 3 weeks of age (3W), 10W. The percentage of SP cells decreased at PN3 in mice and was approximately 0.05% in mice at 10W.