Muscle contraction is the activation of tension-generating sites within muscle fibers. In physiology, muscle contraction does not necessarily
Chimeric mice are generated where approximately 50% of the cells in the animal are genetically MHC class I-deficient. The other 50% are deficient for the herpes virus receptor, HVEM, but do express MHC class I molecules. When these mice are infected with herpesvirus by intraperitoneal injection, a robust virus-specific CD8 T cell response is detected at day 7 post-infection in the spleens of the infected mice.
Chimeric mice are generated where approximately 50% of the cells in the animal are genetically MHC class I-deficient - Immunobiology
: a branch of biology concerned with the physiological reactions characteristic of the immune state
To learn more about immunobiology
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Answer:
X: Positive gravitropism
Y: Negative gravitropism
Explanation:
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Melanin provides pigmentation to the skin and it also provides UV ray protection (which is its role in the epidermis).
