TTN and neoplasm: PAX7 and MYF5 (marker genes of satellite myogenic cells and myoblasts) are expressed in tumor cells, but MYOG, MYOD1, and TTN (marker genes of myocytes) are rarely expressed in tumor cells (Fig. 2C).[34] Therefore, ERM is regarded as an arrested state in normal skeletal muscle development and is hence considered to originate from SMPCs.[35] However, the feature plot showed that the PEG3/PW1 gene is expressed in tumor cells (Fig. 2C).