News for G2a2c persons
Sorry! Last year you were the G2a5 group, but your G2a5 category was abolished recently. Because of the confirmation that L223 constitutes a broader super group that includes you and the men of the new G2a2a (M286) and G2a2b (L91) subgroups, your subgroup had to be moved in order to be under L223 in the tree.   I initially did not think your G2a2c was located underneath the new L223 in the tree because Mr. Phillips from your subgroup was negative for it in 23andMe testing.  However the testing that was done to confirm he is actually positive for L223 is considered much more accurate.  I had the lab director go back and review the findings, and he has no doubt that your L293 is a valid subgroup of L223 and Mr. Phillips has this mutation.
Because your subgroup is so new, researchers have not yet tested for the SNP mutation (L293) that identifies it.  In addition, they have typically avoided testing for the YCA marker, and you all have an extremely rare finding at that marker.  So I have little to report to you on the research news front.
Because you all share the unusual YCA marker value, it is very likely that those of you have not tested for L293 will have this L293 mutation.  However, additional data are always welcome, and if anyone wants to test for L293 for $29 I will not try to dissuade him.  It is possible that not everyone with the YCA oddity whill also have L293.  But this needs to be decided on a case by case basis as to whether testing L293 is indicated.  Those very close genetically to someone who tested have no need  to test, but I would have to check how close you are genetically to someone who tested.
As mentioned in the general news section, if you are willing to better define your grouping, I will be glad to give individual recommendations and help. rayhbanks@cox.net.