In proteins, there are three types of chromophores relevant for UV/Vis spectroscopy:

• peptide bonds (amide bond);

• certain amino acid side chains (mainly tryptophan and tyrosine); and

• certain prosthetic groups and coenzymes (e.g. porphyrine groups such as in haem).

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#Unit 4. Cell Communication and Cell Signaling

B-cell survival in the follicle is dependent on access to the TNF-family member cytokine B-cell activation factor (BAFF), otherwise known as B lymphocyte survival factor (BLyS), which is secreted by the FDCs.

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#Unit 4. Cell Communication and Cell Signaling

B-cell activation

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#Unit 4. Cell Communication and Cell Signaling

TLS Online TPP Program

#Id: 10358

#Unit 4. Cell Communication and Cell Signaling

T-dependent response

Recognition of protein antigens and requires the participation of CD4 helper T cells

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#Unit 4. Cell Communication and Cell Signaling

TLS Online TPP Program

#Id: 10360

#Unit 4. Cell Communication and Cell Signaling

Plasma cell decision point