Figure 4. Regulation of retinal muscarinic receptor subtype gene expression during myopia development. The regulation of the five mAChRs was assessed in the tree shrew retina using real-time PCR and the DNA-binding dye, SYBR green I. Data was calculated relative to the housekeeping gene, HPRT, and expressed relative to the contralateral control eye (for myopic groups) or left/right eyes (for normal groups). Data are shown as the mean percentage change±SEM (n=6).