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Fig. 1. Main themes of temporal patterns of hypoxia adaptation. (1) Immediate or
constitutive, exemplified by the northern painted turtle, Chrysemys
picta. (2) Developmental, as in the relative hypoxia of the in
utero environment. (3) Slow or chronic, as exemplified by human
adaptation to high-altitude hypoxia over the course of many days (photo
courtesy of R. Boutilier).