The Shadow World atlas says stats for extinct races arent given, since there are so few of them left that running into one would be rare. That was for all the extinct races, rather than just the Jinteni. I figure there might be a couple still around. Which means there genes might still be around. They could be producing half Jinteni kids. The Thesians are probably descendents of the Jinteni, so I had an idea of genetic manipulation with Jinteni genes, so thought I'd locate some of their generic stats.