Two different kinds of sorting signals:

Membrane cargo proteins carry cytoplasmic sorting signals

Soluble cargo proteins carry luminal sorting signals

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#Id: 6612

#Unit 7. System Physiology – Animal

Secretion of progesterone during the latter half of the cycle raises the body temperature about 0.5°F

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#Id: 3405

#Unit 3. Fundamental Processes

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. 

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#Id: 6966

#Unit 8. Inheritance Biology

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#Id: 8149

#Unit 2. Cellular Organization

ARF and Sar1 similar to Ras

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#Id: 1049

#Unit 5. Developmental Biology

The apical ectodermal ridge is a thickening of the ectoderm at the apex of the developing limb bud.