IM (IMMUTANS). Identical to Alternative oxidase 4, chloroplast/chromoplast precursor (AOX4) [Arabidopsis Thaliana] (GB:Q56X52;GB:O49631;GB:Q9SBA4;GB:Q9ZSQ3); similar to AOX2 (alternative oxidase 2), alternative oxidase [Arabidopsis thaliana] (TAIR:AT5G64210.1); similar to Alternative oxidase [Medicago truncatula] (GB:ABD32645.1)