Abstract
The monocarboxylate transporter 1 (MCT1) is highly expressed in the outer retina, suggesting that it plays a critical role in photoreceptors. We examined MCT1 (+/-) heterozygotes, which express half of the normal complement of MCT1. The MCT1 (+/-) retina developed normally and retained normal function, indicating that MCT1 is expressed at sufficient levels to support outer retinal metabolism.