Class II, but not class I, presentation is inhibited by treatment of the cells with an agent that blocks endocytic processing within the cell (chloroquine).

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#Unit 4. Cell Communication and Cell Signaling

Ras-GAP protein, 

NF1 (neurofibromatosis)

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#Unit 4. Cell Communication and Cell Signaling

Receptor Homodimerization 

Cytokines (erythropoietin) activate receptors by forming dimers of two identical cytokine receptor proteins

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#Unit 13. Methods in Biology

IEF is a highly sensitive analytical technique and is particularly useful for studying  microheterogeneity in a protein. For example, a protein may show a single band on an SDS gel but may show three bands on an IEF gel. This may occur, for example, when a protein exists in mono-, di- and tri-phosphorylated forms. 

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#Unit 2. Cellular Organization

Plk1 is critical for formation of the mitotic spindle as well as for chromosome segregation.

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#Unit 10. Ecological Principles

Net primary productivity is commonly measured by harvesting a defined area of an ecosystem at the end of the growing season and determining the accumulated biomass of producers