Turns are classified into several classes, like 

β-Turn  (I, II, I’, II’) 

α -Turn 

γ- Turn

π -Turn

TLS Online TPP Program

#Id: 1741

#Unit 4. Cell Communication and Cell Signaling

TLS Online TPP Program

#Id: 1742

#Unit 4. Cell Communication and Cell Signaling

MHC-Peptide Interaction

TLS Online TPP Program

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#Unit 4. Cell Communication and Cell Signaling

TLS Online TPP Program

#Id: 1744

#Unit 4. Cell Communication and Cell Signaling

One individual, however, expresses only a small number of these molecules—up to six different class I molecules and 12 or more different class II molecules.

TLS Online TPP Program

#Id: 1745

#Unit 4. Cell Communication and Cell Signaling

MHC molecules in mouse

TLS Online TPP Program

#Id: 1746

#Unit 4. Cell Communication and Cell Signaling

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