ATMAPR2 (ARABIDOPSIS THALIANA MEMBRANE-ASSOCIATED PROGESTERONE BINDING PROTEIN 2); heme binding / transition metal ion binding. Identical to Putative steroid-binding protein 3 (MP3) [Arabidopsis Thaliana] (GB:Q9SK39); similar to MSBP1 (MEMBRANE STEROID BINDING PROTEIN 1) [Arabidopsis thaliana] (TAIR:AT5G52240.1); similar to hypothetical protein [Vitis vinifera] (GB:CAN83013.1); contains InterPro domain Cytochrome b5; (InterPro:IPR001199)