ATCP1 (CA2+-BINDING PROTEIN 1); calcium ion binding. similar to CAM4 (CALMODULIN 4), calcium ion binding [Arabidopsis thaliana] (TAIR:AT1G66410.1); similar to CAM1 (CALMODULIN 1), calcium ion binding [Arabidopsis thaliana] (TAIR:AT5G37780.1); similar to hypothetical protein [Vitis vinifera] (GB:CAN67470.1); contains InterPro domain EF-Hand type; (InterPro:IPR011992); contains InterPro domain Calcium-binding EF-hand; (InterPro:IPR002048)