Expression of Spry1 mRNA during postnatal murine lens growth. Sections of eyes at postnatal stages P0 (A), P14 (B) and P21 (C, D) were labelled for Spry1 transcripts using in situ hybridisation. (A) At P0, Spry1 was strongly expressed in lens epithelial cells (arrow) and early secondary fibre cells (arrowhead). At P14 and P21, Spry1 was primarily expressed in the lens epithelial cells (B, C, arrows). (D) Control sections using a sense-labelled riboprobe showed no signal. Scale bar: 100 μm.