Countercurrent exchange is a passive process; it depends

on movement of water and could not maintain the osmotic gradient along the pyramids if the process of counter-current multiplication in the loops of Henle were to cease.

TLS Online TPP Program

#Id: 10004

#Unit 4. Cell Communication and Cell Signaling

Indian hedgehog is expressed in the gut and cartilage and is important in postnatal bone growth

TLS Online TPP Program

#Id: 10005

#Unit 4. Cell Communication and Cell Signaling

Sonic hedgehog is responsible for assuring that motor neurons come only from the ventral portion of the neural tube & essential for normal patterning of the limbs

TLS Online TPP Program

#Id: 10006

#Unit 4. Cell Communication and Cell Signaling

Hedgehog protein with autoproteolytic activity that cleaves off the C-terminus to reveal a signal sequence that marks the protein for secretion.

TLS Online TPP Program

#Id: 10007

#Unit 4. Cell Communication and Cell Signaling

TLS Online TPP Program

#Id: 10008

#Unit 4. Cell Communication and Cell Signaling

The freed C-terminal is not involved in signaling and is often degraded, whereas the N-terminal becomes the active Hedgehog protein intended for secretion

TLS Online TPP Program

#Id: 10009

#Unit 4. Cell Communication and Cell Signaling

Secretion requires the addition of cholesterol and palmitic acid to the Hedgehog protein