I don't know how relevent this is but I've read several instances that Harlequin is just a type of pattern. I haven't read that it has shown to be genetic. Take that with a grain of salt. I read a lot and sponge info and that's something I've read on multiple occasions. I don't have personal experience on the matter. I'll be following this with some curiousity myself.
Regards,
B
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