A cell-nonautonomous heme acquisition pathway enables erythroid hemoglobinization under stress. - Belot, Audrey; Rock, Andrew; Dutt, Sohini; Haemmerle, Gia; Maros, Amaury; Yuan, Xiaojing; Otsuru, Satoru; Bodine, David; Hamza, Iqbal (Science, 2026)