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Estimated total number (mean ± SD) of cones (a) and rods (b) in retinas from 5-week-old rd mice (C3H/He/N) cultured in DMEM alone and in retinas from 5-week-old rd mice cocultured with 8-day-old normal C57BL/6 mice. *P < 0.0001. There was no significant difference between rod numbers.
