TACO1 and in situ carcinoma: TACO1 knockdown decreased the mitochondria complex IV activity and OCR of T24‐CIS and UMUC3‐CIS cells, while TACO1 overexpression increased the mitochondria complex IV activity and OCR of wild‐type J82 cells, but had no notable impact on extracellular acidification rate (ECAR; Figure 2A,B; Figure S3B, Supporting Information).