11.   Doctors said they could not yet tell which were fraternal twins and which were identical.

12.   For example, studies of twins have found that identical twins are more likely than fraternal twins to share a tendency to become addicted.

13.   Fraternal twins would have the problem in common just as often as identical twins.

14.   Fraternal twins, Reece weighed five pounds, one ounce, and Bennett weighed six pounds, five ounces.

15.   Friends of fraternal twins Ray and Jay Nugent say their lives are a story of good and evil.

16.   Her fraternal twin, Jean Marie, was a college goalie for one season, but recently quit.

17.   Identical twins are formed from the same egg and have twice as many genes in common as fraternal twins, who are formed from two different eggs.

18.   Identical twins can be more closely associated in the womb, lacking one or two membranes that separate fraternal twins.

19.   Identical twins share the same genes, while fraternal twins share half on average.

20.   I have always thought that meant I have an identical twin and a fraternal twin, but now I am not too sure.