Recruitment was initiated with six 'seeds' (initial participants) who were purposively selected in consultation with key informants in the PWID community and diversified on characteristics including sex, age, education, and place where they buy drugs or inject.
◦ As people had spread around the globe, some of their physical characteristics diversified.
Diversifying selection characteristic of such an arms race has been observed in disease resistance loci that interact directly with pathogen effector proteins [61].
Whatever the mechanism of diversification in each tribe, it is clear that clades with very different biological characteristics have diversified to similar degrees in the lake.
Identification of ultramicro inversions within human populations may be helpful in elucidating how phenotypic characteristics have diversified during human evolution.
If a gene is under diversifying selection, the characteristics of the alleles themselves may be less important than the fact that they differ from other alleles in the population.
Among marine life-forms, mollusks (primarily bivalves [pelecypods] and gastropods) became highly diversified, as did reef-building corals characteristic of the tropical belt.
Furthermore, throughout the Jurassic many dinosaur clades diversified [32], leading to the evolution of many extreme morphologies characteristic of these groups.
This phenomenon was not observed in HG tumors, then it would not seem the result of purely random alterations due to culture conditions, but to essential characteristics which diversify the two types of tumor.
