However , mtDNA analysis shows that the two infants are not maternally related .
Nuclear DNA analysis suggests that USR1 and USR2 are closely related , probably somewhere roughly in the range from half - siblings to first cousins .
MtDNA analysis shows that the two infants are not maternally related .
Nuclear DNA analysis suggests that USR1 and USR2 are closely related , probably somewhere roughly in the range from half - siblings to first cousins .