LRAT (Lecithin Retinol Acyltransferase): LRAT is an enzyme that plays a crucial role in vitamin A metabolism by catalysing the conversion of all-trans-retinol into all-trans-retinyl esters, the storage form of vitamin A. This process is essential for vision, immune function, and cellular differentiation. Deficiencies or mutations in LRAT can result in retinal disorders and weakened immune responses, emphasising its importance in maintaining vitamin A balance and overall health.