IFN-  has been shown to induce expression of the class II transcriptional activator (CIITA).

#Id: 9925

#Unit 4. Cell Communication and Cell Signaling

Adenoviruses and cytomegalo virus use to reduce the surface expression of class I MHC molecules, 

Measles virus and HIV, reduce levels of class II MHC molecules on the surface, 

#Id: 391

#Unit 2. Cellular Organization

The H3.H4 tetramer forms the top half of the histone octamer. Histone H3.H4 tetramers occupy a key position in the nucleosome by binding the middle and both ends of the DNA

#Id: 9841

#Unit 6. System Physiology – Plant

Three distinct classes of photoreceptors mediate the effects of UV-A/blue light (320–500 nm): the cryptochromes, phototropins and the ZEITLUPE (ZTL) family of proteins

#Id: 628

#Unit 2. Cellular Organization

Transcription is initiated at the beginning of the 162 nucleotide mRNA leader encoded by a DNA region called trpL.

#Id: 2482

#Unit 13. Methods in Biology

The polymerization of acrylamide is an example of free-radical catalysis and is initiated by the addition of ammonium persulfate and the base N,N,N′,N′-tetramethylenediamine ( TEMED).