The number of Na + channels per square micrometer of membrane in myelinated mammalian neurons has been estimated: 

50–75 in the cell body, 350–500 in initial segment, less than 25 on the surface of the myelin, 2000–12,000 at the nodes of Ranvier & 20–75 at the axon terminals 

TLS Online TPP Program

#Id: 1891

#Unit 4. Cell Communication and Cell Signaling

T-cell education

TLS Online TPP Program

#Id: 1892

#Unit 4. Cell Communication and Cell Signaling

Relationship between TCR affinity and selection

TLS Online TPP Program

#Id: 1893

#Unit 4. Cell Communication and Cell Signaling

Superantigens

Viral or bacterial proteins that bind simultaneously to the Vβ domain of a T-cell receptor and to the α chain of a Class II MHC molecule

TLS Online TPP Program

#Id: 1894

#Unit 4. Cell Communication and Cell Signaling

The decision of double-positive thymocytes to become helper CD4 or cytotoxic CD8 T cells.

TLS Online TPP Program

#Id: 1895

#Unit 4. Cell Communication and Cell Signaling

T-Cell Activation and Differentiation

TLS Online TPP Program

#Id: 1896

#Unit 4. Cell Communication and Cell Signaling

Regulatory T cells inactivate traditional T cells.