mammal

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mammal

 [mam´al]
an individual of the Mammalia, a division of vertebrates, including all that possess hair and suckle their young. adj., adj mammal´ian.

mam·mal

(mam'ăl),
An animal of the class Mammalia.

mammal

(măm′əl)
n.
Any of various warm-blooded vertebrate animals of the class Mammalia, including humans, characterized by a covering of hair on the skin and, in the female, milk-producing mammary glands for nourishing the young.

mam·ma′li·an (mă-mā′lē-ən) adj. & n.

mammal

any animal of the class Mammalia, a group of about 4250 species, often regarded as the most highly evolved animals, and so named because they all possess MAMMARY GLANDS. There are three living subclasses:
  1. Monotremata - MONOTREMES, primitive egg-laying mammals such as the duck-billed platypus and Echidna, the spiny ant eater.
  2. Marsupialia - MARSUPIALS, which transfer their young to pouches for the latter part of their early development.
  3. Eutheria - EUTHERIANS, which have a placenta.

Mammals are characterized by the presence of hair, a DIAPHRAGM used in AERIAL RESPIRATION, milk secretion in the female (LACTATION) for suckling the young, presence of only the left systemic arch in the blood circulatory system, three auditory ossicles in the ear, and a lower jaw of a single pair of bones. In all classes except the monotremes, the young are born live (see VIVIPAROUS).

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However, development of recombinant mammalian cell lines is often hindered by the unstable and variable transgene expression associated with random integration.
This study was designed to explore the wild mammalian fauna of Mahaban and Malka valley and available threats to the wild mammalian fauna of Malka and Mahaban district Buner, Khyber Pakhtunkhwa, Pakistan.
In addition, it was to determine differences between enzyme activity and the effect of the mammalian sex hormone on differentiation of regenere plantlets.
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In part for these reasons, there have been several recent works directed at furthering our knowledge of mammalian teeth, most notably books by Lucas (Dental Functional Morphology: How Teeth Work, 2004, Cambridge University Press) as well as Teaford, Smith and Ferguson (Development, Function and Evolution of Teeth, 2000, Cambridge University Press).
Researchers have developed a technique for creating mammalian cells containing a single set of chromosomes that could allow scientists to better establish the relationships between genes and their function.
ATR exposure has been associated with defects in sexual development in animals, but no cellular target has been identified in studies on mammalian systems.
Studies which supposedly revealed the existence of mammalian pheromones are debunked and the author maintains there is no accepted scientific definition of what constitutes a mammalian pheromone.
University of Pennsylvania (Philadelphia, PA) has patented replication competent variants of mammalian immunodeficiency virus comprising mutations and/or deletions of the V3 hypervariable loop and compensatory mutations, as well as methods for producing such variants.