There are two de novo methyltransferases (Dnmt3A and Dnmt3B) in the mouse; they have different target sites, and both are essential for development.

TLS Online TPP Program

#Id: 1912

#Unit 4. Cell Communication and Cell Signaling

T1 cells are mIgMhi, mIgD -/lo, CD21-, CD23-, CD24+, and CD93+.  T2 cells differ from T1 cells in having higher levels of mIgD and in expressing CD21 and CD23.

TLS Online TPP Program

#Id: 7545

#Unit 6. System Physiology – Plant

GAI and RGA proteins normally act as repressors of gibberellin responses. Gibberellin acts indirectly through an unidentified signaling intermediate, which is thought to bind to the regulatory domains of the GAI and RGA Proteins. 

TLS Online TPP Program

#Id: 5303

#Unit 7. System Physiology – Animal

Atrial systole 

Increase in atrial pressure is reflected back to the veins, it appears on the venous pulse record as the a wave.

TLS Online TPP Program

#Id: 10371

#Unit 4. Cell Communication and Cell Signaling

A given MHC molecule can bind numerous different peptides, and some peptides can bind to several different MHC molecules. Because of this MHC molecule is often referred to as “promiscuous”.

TLS Online TPP Program

#Id: 2601

#Unit 13. Methods in Biology

A modification of overlap extension PCR may also be used to construct directed mutations; this is termed megaprimer PCR .