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Can stem cells be defined as legitimate units of selection (UOS)? Here I review traits of hallmark stem cells (many of which are manifested in marine organisms), which collectively reveal that some types of stem cells behave as real UOS entities. The two existing categories of stem cells maintain the soma and the germ line, have infallible high capacity for self-renewal, produce diverse lines of differentiated...
Chimerism is the presence of cells derived from more than one individual in a given individual. This phenomenon has been detected in a wide variety of multicellular organisms, including vertebrates. In mammals natural chimerism can develop from bidirectional trafficking of cells between multiple fetuses or between the fetus and its mother during pregnancy. Because stem cells are the only self-renewing...
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