β Sheets in proteins contain 2 to as many as 22 polypeptide strands, with an average of 6 strands. 

Each strand may contain up to 15 residues, the average being 6 residues.

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#Id: 9274

#Unit 6. System Physiology – Plant

Bacterial Nod genes are activated to initiate nodulation in plants by plant signals flavonoids

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#Id: 9415

#Unit 11. Evolution and Behavior

Lack the form of sex based on meiosis that is familiar from animals and plants, they exchange genes using a variety of mechanisms that together are called “parasexuality”

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#Id: 3344

#Unit 6. System Physiology – Plant

Each c subunit has a critical Asp (or Glu) residue about midway across the membrane, which can donate or accept a proton.

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#Id: 10087

#Unit 4. Cell Communication and Cell Signaling

TGF-β1 and TGF-β3 contain RGD motif that binds to integrins.

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#Id: 171

#Unit 5. Developmental Biology

FGF8 

A secreted signal that is received by the lens cells and induces the production of the L-Maf transcription factor.