Recombination between the VH and D-JH segments follows during the pro-B-cell stage.

TLS Online TPP Program

#Id: 7910

#Unit 2. Cellular Organization

Mitochondria-associated membranes (MAMs)

The portions of the ER membranes that form special contact regions with the mitochondria.

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#Id: 5188

#Unit 7. System Physiology – Animal

The initial reaction in the intrinsic system is conversion of inactive factor XII to active factor XII (XIIa).

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#Id: 8386

#Unit 2. Cellular Organization

In the presence of ATP,  myosin head releases from the actin filament. 

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#Id: 9974

#Unit 4. Cell Communication and Cell Signaling

In the absence of Wnt,

TCF is associated with transcriptional repressor proteins Groucho (Gro) that inhibit gene transcription in nucleus

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#Unit 3. Fundamental Processes

FENl is an exo-jendonuclease that recognizes the structure created when one strand of DNA is displaced from a duplex as a "flap." In mammalian replication it cleaves at the base of the flap to remove the RNA primer.