AHB1 (Non-symbiotic hemoglobin 1) is involved in a cellular response to hypoxia and displays oxygen carrier activity. Alternative names: ARAth, GLB1, Hb1AHB1, ARATH GLB1, ATGLB1, CLASS I HEMOGLOBIN, GLB1, HB1, HEMOGLOBIN 1, NSHB1, PGB1, PHYTOGLOBIN 1.