Structure of Wnt proteins 

22 cysteine residues, which form disulfide bridges that maintain a globular secondary structure.

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#Id: 126

#Unit 5. Developmental Biology

The prospective lens cells secrete paracrine factors that instruct the optic vesicle to form the retina. 

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#Id: 7390

#Unit 5. Developmental Biology

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#Id: 1737

#Unit 4. Cell Communication and Cell Signaling

Class I MHC, glycoproteins expressed on the surface of nearly all nucleated cells; the major function of the class I is presentation of endogenous peptide antigens to CD8+ T cells.

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#Id: 2269

#Unit 11. Evolution and Behavior

Phenotypic plasticity can be visualized with the reaction norm.

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#Id: 8513

#Unit 2. Cellular Organization