SOS response in E. coli: 

The LexA protein is the repressor in this system, which has an operator site near each gene. Because the RecA gene is not entirely repressed by the LexA repressor, the normal cell contains about 1,000 RecA monomers. 

TLS Online TPP Program

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#Unit 4. Cell Communication and Cell Signaling

Granulocytes

1. Neutrophils

2. Basophils

3. Mast cells

4. Eosinophils

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#Unit 4. Cell Communication and Cell Signaling

Granulocytes can be seen by FACS.

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#Id: 1701

#Unit 4. Cell Communication and Cell Signaling

Neutrophils constitute the majority (50% to 70%) of circulating leukocytes Eosinophils (1%–3%), Basophils (1%), or Mast cells (1%).

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#Id: 1702

#Unit 4. Cell Communication and Cell Signaling

The resulting transient increase in the number of circulating neutrophils, called leukocytosis.

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#Id: 1703

#Unit 4. Cell Communication and Cell Signaling

Neutrophils phagocytose (engulf) bacteria very effectively, and also secrete a range of proteins that have antimicrobial effects and tissue remodeling potential.

TLS Online TPP Program

#Id: 1704

#Unit 4. Cell Communication and Cell Signaling

Neutrophils- First cell against infection