Multiple perspectives.
N L
NL
Segal
D000368:Aged; D000369:Aged, 80 and over; D000818:Animals; D002417:Cattle; D019976:Cloning, Organism; D006801:Humans; D008136:Longevity; D008297:Male; D009099:Multiple Birth Offspring; D011783:Quadruplets; D014310:Triplets; D014430:Twins, Monozygotic