When geneticists wanted to know if hair-pulling was genetic or not, they played with the DNA of mice and altered several genes to see if these symptoms would be present.
Mice showed symptoms of hair pulling.
LINK
This link also discusses why Trich is not like OCD and the differences in the brain that back this up. I would suggest a good read.
Mice showed symptoms of hair pulling.
LINK
This link also discusses why Trich is not like OCD and the differences in the brain that back this up. I would suggest a good read.
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