The crystal structure of PCNA closely resembles the E. coli b subunit: A trimer forms a ring that surrounds the DNA.  The sequence and subunit organization are different from the dimeric b2 clamp; however, the function is likely to be similar.

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#Id: 9591

#Unit 11. Evolution and Behavior

TLS Online TPP Program

#Id: 9711

#Unit 4. Cell Communication and Cell Signaling

GTP-bound Cdc42, binds to and activates the Ste20 kinase.

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#Id: 5556

#Unit 7. System Physiology – Animal

Type B intercalated cells have functions opposite to those of type A cells and secrete bicarbonate into the tubular lumen while reabsorbing hydrogen ions in alkalosis

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#Id: 6899

#Unit 3. Fundamental Processes

5-hydroxymethylcytosine (5hmC) is now novel epigenetic marks. The “teneleven translocation 1-3” or Tet1-3 proteinsare DNA TET hydroxylase enzymes that can convert 5mC to 5hmC, and can further convert 5hmC to 5-formylcytosine (5fC) and then 5- carboxylcytosine (5caC) in successive reactions.

TLS Online TPP Program

#Id: 4658

#Unit 13. Methods in Biology

CFSE labeling amount of fluorescence emitted is cut in half each time the cell divides.