these same genes <related> to the production of myelin


-- By using the genetic components of progeria, I was able to reverse the aging process in much the same way the disease expedited it. (..............) Once I isolated the progeria receptors I stumbled on something quite unexpected -- these same genes related to the production of myelin.
-- The material that insulates neurons in the body.
The X-Files, TV series

I think that "related" here is the past simple in the active voice, not passive:

these same genes (that are/were) related to the production of myelin.:cross:

Am I correct?

Thank you.
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