The two major parts of the eye (lens and retina) co-construct each other, and the eye forms from reciprocal paracrine interactions.

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#Id: 4738

#Unit 5. Developmental Biology

The anterior-posterior axis is determined before the first cell division, and the cleavage furrow is located asymmetrically along this axis of the egg, closer to what will be the posterior pole.

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#Id: 6505

#Unit 7. System Physiology – Animal

Principal catecholamines synthesized by the adrenal medulla:

Norepinephrine

Epinephrine

Dopamine

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#Id: 1631

#Unit 4. Cell Communication and Cell Signaling

C5b67 complexes can insert into the membrane of nearby cells and mediate “innocent bystander” lysis.

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#Id: 6786

#Unit 3. Fundamental Processes

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#Id: 2258

#Unit 11. Evolution and Behavior

Directional selection leads to fixation of the favored allele and elimination of the other allele.