https://www.selleckchem.com/products/nik-smi1.html
Postcranial skeletal pneumaticity (i.e., epithelial-lined, air-filled bones) is a condition unique to birds among extant tetrapods. Previous research reveals extensive variation in the expression of this trait in different bird species, from taxa that pneumatize nearly the entire skeleton to others that do not pneumatize a single bone. These studies, however, have primarily focused on aquatic/semi-aquatic birds, specifically Anseriformes (screamers, ducks, geese, swans) and Aequorlitornithes (loons, gulls, penguins, storks, etc.). This
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