The rats in the TGF-β2 group developed myopia in their right eye (change in axial length: 0.27 ± 0.02 mm), whereas the rats in the NC, EP21, and TGF-β2 + EP21 did not (change in axial length: 0.21 ± 0.03, 0.23 ± 0.03, and 0.20 ± 0.02 mm, respectively; Figure 1c). This evidence concerns the gene TGFB2 and myopia.