Sonic hedgehog, is the major active factor in the ZPA. 

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#Id: 2367

#Unit 5. Developmental Biology

Zeta neoblasts give rise to epidermal cell fates through a prog-1-positive postmitotic precursor state.

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#Id: 8415

#Unit 2. Cellular Organization

Dilated cardiomyopathy

Minor missense mutations in the cardiac actin gene

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#Id: 6256

#Unit 8. Inheritance Biology

-         +         - -          +         - +          +        +           - 1          2         3           4                5         6 +          -         +           +                - +          -         +           +                -          -

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#Id: 8162

#Unit 2. Cellular Organization

For selective export of certain membrane proteins from the ER contain a di-acidic sorting signal (Asp-X-Glu, or DXE), which binds to the Sec24 subunit of the COPII

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#Id: 9162

#Unit 11. Evolution and Behavior

A recessive allele (a) that causes a genetic disease has a frequency (q) of 0.01. If the population mates randomly (F = 0), the frequency of individuals affected by the disease (aa) will be q = 0.01 = 0.0001.

However, if F = 0.25 expected frequency of the aa is .0026.