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Figure 1
Evolution of lactation and teats. Lactation evolved in the synapsids, while teat development occurred in the therians after the split of the protherian and metatherian lineages. Of the features shown in this phylogeny, only lactation is a characteristic that is common to the entire group.

Journal logoSTRUCTURAL BIOLOGY
COMMUNICATIONS
ISSN: 2053-230X
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