In this sentence
Some versions are derived by seeding faults, called mutants, of the original versions.
Why do we use called, rather than call?
Answer
Because the name, mutants, was given in the past.
We say:
I’m Roberto, but call me Bob.
My name’s Roberto, but you can call me Bob.
Call me if you need help
"Call" in all three cases is used in the simple present tense.
Attribution
Source : Link , Question Author : william007 , Answer Author : Mari-Lou A
