Credit: © 2023 Qin et al. Originally published in Journal of Experimental Medicine. https://doi.org/10.1084/jem.20220776
By the age of four months, the retinas of mice carrying a mutation in the gene encoding PDE6β (left) are thin and lack rod photoreceptors (red). But mice who have had this mutation corrected through the PESpRY system (right) have much thicker retinas containing numerous rod cells.