José Ignacio Arroyo

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Cetaceans, early in their evolutionary history, had developed many physiological adaptations to secondarily return to the sea. Among these adaptations, changes in molecules that transport oxygen and that ultimately support large periods of acute tissue hypoxia probably represent one big step toward the conquest of aquatic environments. Myoglobin contributes(More)
The relaxin/insulin-like gene family is related to the insulin gene family, and includes two separate types of peptides: relaxins (RLNs) and insulin-like peptides (INSLs) that perform a variety of physiological roles including testicular descent, growth and differentiation of the mammary glands, trophoblast development, and cell differentiation. In(More)
The relaxin/insulin-like gene family includes signaling molecules that perform a variety of physiological roles mostly related to reproduction and neuroendocrine regulation. Several previous studies have focused on the evolutionary history of relaxin genes in anthropoid primates, with particular attention on resolving the duplication history of RLN1 and(More)
The relaxin gene family is a group of genes involved in different physiological roles, most of them related to reproduction. In vertebrates the genes in this family are located in three separate chromosomal locations, and have been called relaxin family locus (RFL) A, B, and C. Among mammals the RFLA and RFLC are the most conserved as no gene copy-number(More)
The relaxin/insulin-like (RLN/INSL) gene family comprises a group of signaling molecules that perform physiological roles related mostly to reproduction and neuroendocrine regulation. They are found on three different locations in the mammalian genome, which have been called relaxin family locus (RFL) A, B, and C. Early in placental mammalian evolution, the(More)
Hair represents an evolutionary innovation that appeared early on mammalian evolutionary history, and presumably contributed significantly to the rapid radiation of the group. An interesting event in hair evolution has been its secondary loss in some mammalian groups, such as cetaceans, whose hairless phenotype appears to be an adaptive response to better(More)
The circadian clock is a central oscillator that coordinates endogenous rhythms. Members of six gene families underlie the metabolic machinery of this system. Although this machinery appears to correspond to a highly conserved genetic system in metazoans, it has been recognized that vertebrates possess a more diverse gene inventory than that of(More)
Andean orogeny and the ecological changes that followed promoted diversification in plant and animal lineages since the Early Miocene. The angiosperm genus Caiophora (Loasaceae, subfam. Loasoideae) comprises around 50 species that are endemic to South America. These are distributed from southern Ecuador to Central Chile and Argentina. Bee pollination and(More)
We thank Marcela Moré and Cristina Acosta (IMBIV, CONICET, Universidad Nacional de Córdoba, Argentina); Romina Vidal-Russel (INIBIOMA, CONICET, Universidad Nacional del Comahue); Jorge Strelin, Mateo Martini and Diego Gaiero (CICTERRA, Universidad Nacional de Córdoba, Instituto Antártico Argentino); Matías Ghiglione (Instituto de Estudios Andinos, CONICET,(More)
The hemoglobin of jawed vertebrates is a heterotetramer protein that contains two α- and two β-chains, which are encoded by members of α- and β-globin gene families. Given the hemoglobin role in mediating an adaptive response to chronic hypoxia, it is likely that this molecule may have experienced a selective pressure during the evolution of cetaceans,(More)
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