Putative membrane protein; upregulated by toxic concentrations of heavy metal ions including Mn2+, Co2+, Ni2+, Cu2+, and Zn2+; mRNA identified as translated by ribosome profiling data; localizes to the cytoplasm, possibly in intracellular membranes; CYSTM (cysteine-rich transmembrane module) family member; partially overlaps dubious ORF YBR056C-B; YBR056W-A has a paralog, YDR034W-B, that arose from the whole genome duplication