Shuttling protein have identified at least three different types of NESs: 

A. A leucine-rich sequence found in PKI 

B. In the Rev protein of human immunodeficiency virus (HIV)

C. In two heterogeneous ribonucleoprotein particles (hnRNPs)

TLS Online TPP Program

#Id: 9318

#Unit 4. Cell Communication and Cell Signaling

Rapid termination mechanisms of the Rhodopsin Signalling:

1.GAP that inactivates Gαt·GTP

2.Ca2+ -sensing proteins that activate Guanylate Cyclase

3.Rhodopsin Phosphorylation and Binding of Arrestin

TLS Online TPP Program

#Id: 1697

#Unit 4. Cell Communication and Cell Signaling

ZnA and ZnB on RAG1 are regions of the proteins that form zinc fingers, elongated protein domains stabilized by the coordination of a Zn ion.

TLS Online TPP Program

#Id: 7601

#Unit 5. Developmental Biology

In one pathway, sperm that have undergone the acrosome reaction bind directly to ZP2

TLS Online TPP Program

#Id: 9624

#Unit 4. Cell Communication and Cell Signaling

Two Mechanisms Down-Regulate Signaling from RTKs

1. Phosphotyrosine phosphatases

2. Receptor-mediated endocytosis followed by degradation in lysosomes

TLS Online TPP Program

#Id: 923

#Unit 13. Methods in Biology

The 51Cr Release Assay is used to measure Cell death not apoptosis