Wnts are paracrine factors that make up a large family of cysteine-rich glycoproteins.

TLS Online TPP Program

#Id: 175

#Unit 5. Developmental Biology

In instructive interaction, 

a signal from the inducing cell is necessary for initiating new gene expression in the responding cell.

TLS Online TPP Program

#Id: 9089

#Unit 4. Cell Communication and Cell Signaling

ADP-ribosylation blocks the GTPase activity of Gαs and renders Gαs permanently active. 

TLS Online TPP Program

#Id: 10318

#Unit 4. Cell Communication and Cell Signaling

Cytotoxic T cells release granules containing the proteins perforin and granzyme-B. 

TLS Online TPP Program

#Id: 5180

#Unit 7. System Physiology – Animal

Serum has a higher serotonin content because of the breakdown of platelets during clotting.

TLS Online TPP Program

#Id: 7909

#Unit 2. Cellular Organization

Membrane contact sites (MCSs)

Mitochondria establish MCSs with many other organelles, including ER, lysosomes, peroxisomes, the plasma membrane, the Golgi, endosomes, and even lipid droplets.