ATBCB (ARABIDOPSIS BLUE-COPPER-BINDING PROTEIN); copper ion binding. Identical to Blue copper protein precursor (BCB) [Arabidopsis Thaliana] (GB:Q07488;GB:O82664); similar to UCC3 (UCLACYANIN 3), copper ion binding [Arabidopsis thaliana] (TAIR:AT3G60280.1); similar to Chain A, Umecyanin From Horse Raddish- Crystal Structure Of The Oxidised Form (GB:1X9R); similar to umecyanin [Armoracia rusticana=horseradish, roots, Peptide, 115 aa] (GB:AAB34409.1); similar to Umecyanin (UMC) (GB:P42849); contains InterPro domain Blue (type 1) copper domain; (InterPro:IPR000923); contains InterPro domain Cupredoxin (InterPro:IPR008972); contains InterPro dom