👉 Heterophasia is a medical condition in which two or more different types of cells are present in a single cell line. This can occur when the same genetic material is used to make multiple different types of proteins, enzymes, and other molecules. In this case, only one type of cell is being generated, but it has been produced by several different genes. Heterophasia is characterized by a variety of symptoms, including fatigue, weight loss, muscle weakness, and mood swings.