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## Abstract The mammary gland is a skin gland unique to the class Mammalia. Despite a growing molecular and histological understanding of the development and physiology of the mammary gland, its functional and morphological origins have remained speculative. Numerous theories on the origin of the m
## Abstract From early on in evolution, organisms have had to protect themselves from pathogens. Mechanisms for discriminating βselfβ from βnonβselfβ evolved to accomplish this task, launching a long history of hostβpathogen coβevolution. Evolution of mechanisms of immune defense has resulted in a
T he development of immune defense mecha- nisms begins early during fetal life but is not completely achieved at birth, leading to a peculiar susceptibility of the neonate to infectious diseases. 1,2 The earliest hematopoietic stem cells are detectable in the yolk sac around 6 weeks of gestation, bu
## Abstract Β© 2005 Wiley Periodicals, Inc. J Biochem Mol Toxicol 19:177β179, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/jbt.20075