What part of the virus did hershey-chase experiment show had entered bacteria?

The Hershey-Chase experiment was able to distinguish whether genetic material of T2 phage was composed of DNA or protein to infect E. coli.

The experiment provided crucial evidence that DNA is the genetic material because the radioactivity from the phage DNA was found inside the bacteria after infection, while the radioactivity from the phage proteins remained outside. This was a groundbreaking discovery that shattered the prevailing notion of that time, the "protein-only" hypothesis, which proposed that proteins were the exclusive genetic material. The experiment's findings have since become a fundamental principle in genetics.