Expression of class II molecules by B cells is down-regulated by IFN-¥. 

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#Id: 9579

#Unit 11. Evolution and Behavior

Silurian - Origin of jawed fishes and arthropods, Invasion of land by primitive land plants

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#Id: 3352

#Unit 3. Fundamental Processes

Photoreactivation directly reverses the formation of pyrimidine dimers that result from ultraviolet irradiation.

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#Id: 7065

#Unit 3. Fundamental Processes

The addition of the 3’-CCA is catalyzed by the enzyme tRNA nucleotidyltransferase, which functions as a nontemplate-directed RNA polymerase.

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#Id: 5304

#Unit 7. System Physiology – Animal

Atrial systole 

ventricle is relaxed, & because the AV valve is open, the ventricle is filling with blood from the atrium, even prior to atrial systole.

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#Id: 3805

#Unit 5. Developmental Biology

High PSF to food ratio is upregulate the translation of the PKA catalytic subunit PKA-C.