The role of lutein-rich purple sweet potato leaf extract on the amelioration of diabetic retinopathy in streptozotocin-induced Sprague-Dawley rats. - Hisamuddin ASB; Naomi R; Manan KAB; Bahari H; Othman F; Embong H; Ismail A; Ahmed QU; Jumidil SH; Hussain MK; Zakaria ZA (Frontiers in pharmacology, 2023)