Amino acid insufficiency impairs hepatic vitamin A mobilization in mice

Proceedings of the National Academy of Sciences, Volume 122, Issue 45, November 2025. SignificanceVitamin A is an essential fat-soluble micronutrient that controls critical biological functions. Many organs depend on circulating vitamin A in the form of retinol bound to retinol-binding protein 4 (RBP4) secreted in the bloodstream from the …