T-Cell Activation and Differentiation

TLS Online TPP Program

#Id: 7255

#Unit 5. Developmental Biology

B cells can be negatively signaled through CD22 and FcγRIIb a receptor that recognizes the presence of IgG containing immune complexes in the blood.

TLS Online TPP Program

#Id: 9203

#Unit 11. Evolution and Behavior

Balance natural selection

Balancing selection is a type of natural selection that maintains genetic diversity in a population.

In balancing selection, two or more alleles are kept in balance, and therefore are  maintained in a population over the course of many generations.

TLS Online TPP Program

#Id: 9578

#Unit 11. Evolution and Behavior

Ordovician - Primitive plants and fungi colonize land, first jawless vertebrates,  Mass extinction at end of period

TLS Online TPP Program

#Id: 3085

#Unit 3. Fundamental Processes

Long filaments form when septum formation is inhibited, but chromosome replication is unaffected.

TLS Online TPP Program

#Id: 3859

#Unit 5. Developmental Biology

The binding of ammonia to the sensor domain of DhkC leads to the activation of its histidine kinase activity and to the autophosphorylation of a DhkC histidine residue.