Potential calcium sensor that binds calcium in vitro. Binds to ABCG36. Expressed in cotyledons, stipule, young leaves and at the hypocotyl-root junction. In mature root, expressed in the stele, cortex, emerging lateral root, root tip and root cap. In mature plant, expressed at the base of cauline and floral branches, and in rosette and cauline leaves. Expressed from stage 9 to 14 of flower development in anthers. At stage 15, expressed in carpel, sepals, petals and pollen until dehiscence. Expressed in developing seeds and young siliques. By touch, salt and hydrogen peroxide treatments, drought stress, wounding, dark and infection by the bacterial pathogen P.syringae. Although assigned as a calmodulin family member by Ref.5, it only contains EF-hand domains.