What item does Jerome (Vincent) place on the comb at his workstation?

In the context of the film "Gattaca," Jerome (who uses the name Vincent) is a genetically modified individual who strives to break free from the societal constraints placed on him due to his lower status. He is known for utilizing the hair that he places on the comb at his workstation as a means to forge an identity that allows him to pursue his dreams. By using a strand of hair, he is able to manipulate genetic testing processes that favor individuals with superior genetic backgrounds. This serves as a crucial method for Jerome to assume the identity of a genetically elite person, effectively allowing him to navigate a world designed to limit his opportunities based on his original genetic makeup. The action of placing hair on the comb underscores the themes of identity, genetic determinism, and the lengths to which individuals will go to overcome societal limitations.