Voltage-dependent peptide-sensitive high conductance rectifying cation channel with a strong affinity for TIC32 that is imported into the chloroplast. Conductance is pH-dependent decreasing with decreasing pH values. Forms an hourglass-shaped multimeric complex. Ubiquitously expressed at low levels. Mostly present in cotyledons, and accumulates in seedlings and embryos. During seed development, confined to green cotyledons of mature embryos. In germinating seedlings, detected in cotyledons and the root hair zone of the primary root. In older seedlings, restricted to cotyledons. Belongs to the plastid outer envelope porin OEP37 (TC 1.B.47) family.