Day 24 has 90 protein-coding genes, including TNNT2 which encodes the cardiac muscle troponin T protein. While both heart and skeletal muscle have troponin, cardiac troponin T is a form that is only expressed in the heart. When heart cells die, their troponin can be detected in the blood. Testing blood for troponin T is a very sensitive and specific test for heart attack.
TNNT2 is conserved across bony vertebrates, meaning it is at least 420 million years old.
Click here to see your TNNT2 gene on Day 24.