Hence, as we did not find UCP2/3 dependency of mitochondrial Ca2+ uptake in other cell lines (for example, human neuroblastoma cells) but could introduce UCP2/3 dependence of MCU activity in short-term cultured HUVEC cells by PRMT1, we speculate that the contribution of UCP2/3 in mitochondrial Ca2+ uptake rather depends on PRMT1 activity than whether or not the cell is immortalized. This evidence concerns the gene UCP2 and neuroblastoma.