The carry the deoxygenated blood from the heart to the lungs and Pulmonary veins do the opposite!
They might have concluded that both protein and DNA transmitted hereditary material. The 32P was a radioisotope in DNA, and the 35S was a radioisotope in proteins. They were used to track the DNA and proteins to see if they were injected by a virus into a bacterium. <span>Hugs</span>
Stop littering and use paper bags instead of plastic bags for groceries
