Original sentence: In human genetics, E1b1b1a (E-M78), formerly E3b1a, is a commonly occurring Y haplogroup, or male line, defined by mutations upon the Y chromosome.It is a sub-clade of E1b1b1
Edited sentence: E1b1b1a is a sub-clade of E1b1b1.In human genetics, E1b1b1a (E-M78), formerly E3b1a, is a human Y-chromosome DNA haplogroup