sentences:  For instance, a survey of Y chromosomes in over 2000 men from different parts of Africa reported that 7.5% carried haplogroup BT(xDE, KT), i.e.were members of haplogroup BT but not DE or K; such a sample might or might not include members of haplogroups B, C, or F (excluding K), or some undiscovered branch(es) of BT belonging to none of these.In ancient DNA, an Upper Paleolithic European (Gravettian), Vestonice15, belonged to BT, but was not excluded from any subhaplogroup.