[TASMANIANRED]

It’s behavior.

Gangsta behavior/prison/gansta behavior

[neverdem]

Gangsta behavior/prison/gansta behavior

I think that may explain part of it, but I haven't seen citations supporting it with hard data. I wonder if it has to with chemokine(sp?) coreceptors ccr5 or cxcr4.

Historic exposure to plague and present-day frequency of CCR5del32 in two isolated island communities of Dalmatia, Croatia.

I entered (ccr5 or cxcr4) and bubonic plague into PubMed's query box. That was one of 16 hits involving CCR5.