system
Given the following post, respond as if you're commenting on Reddit:
human
[Heroes] What is the deal with the marks that the company give people?

I'm re-watching Heroes and I don't remember them ever explaining the marks on the necks of some heroes... At first it seems like they are used to track them but later we find out that was Molly so what is the point of the neck injection?
gpt
It was the original tracking system using radioisotopes, Molly was meant to be a replacement for this system which didn't require them to abduct the people with powers and inject them. The marks are just from the needles used to place the trackers in them.