Insulin has an AB heterodimer structure with 

One intrachain (A6-A11) 

Two interchain disulfide bridges (A7-B7 and A20-B19)

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#Id: 1150

#Unit 7. System Physiology – Animal

Mesangial cells are contractile and play a role in the regulation of glomerular filtration. 

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#Id: 10414

#Unit 4. Cell Communication and Cell Signaling

Growth factors that stimulate angiogenesis:

Basic fibroblast growth factor, TGF-α, and VEGF

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#Id: 2111

#Unit 8. Inheritance Biology

Heterozygous condition may produce imbalances in the amounts of gene products similar to those produced by extra gene copies.

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#Id: 1718

#Unit 4. Cell Communication and Cell Signaling

FcεRI, which binds IgE with an exceptionally high-affinity constant of 10^10 M^-1 .

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#Id: 1722

#Unit 4. Cell Communication and Cell Signaling

The α chains of the FcεRI, members of the immunoglobulin superfamily, directly bind the IgE heavy chains, whereas the β and γ chains are responsible for signal transduction.