The Foundation Book 1

Book series about a genetically modified human who has reptile DNA infused with human DNA.
He has been engineered by a secret organization called the St Williams Foundation.
The Foundation uses mutated humans to help catch and or kill other mutants.

Teams of these mutant solders are sent out to capture other mutants.
Serif is the main character who has escaped the foundation and is on the run, he recruits a group of kids who join him on his quest to be free from the foundation.