yeah!the so called "alpha-actinin skeletal muscle isoform 3(ACTN3)".Utakimbia wee lakini ukikutana na majitu ambayo yamejaaliwa hii kitu(speed gene),utahemea masikioni!Sasa Bolt ni compound ya aina yake;ACTN3 + GIGANTISM uuuuwiii!kweli ni freak of nature!Usain Bolt is a freak of nature!