Amniote cell specification (germ layer identity)is established before gastrulation starts, but the specification of cell type is controlled by inductive influences during and after migration through the primitive streak.

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#Id: 4675

#Unit 13. Methods in Biology

The interaction between antibody and a particulate antigen results in visible clumping called agglutination. Antibodies that produce such reactions are called agglutinins. 

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#Id: 1196

#Unit 7. System Physiology – Animal

FSH and LH stimulate sex hormone synthesis by the activation of the cyclic adenosine monophosphate second messenger system.

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#Id: 428

#Unit 2. Cellular Organization

Individual nucleosomes can be obtained by treating chromatin with the endonuclease micrococcal nuclease (MNase), which cuts the DNA between nucleosomes, a region known as linker DNA.

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#Id: 8377

#Unit 2. Cellular Organization

Myosins have 

Motor head domain

Lever-arm neck domain

Cargo-binding tail domain

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#Id: 5218

#Unit 7. System Physiology – Animal

In vivo, a plasma Ca 2+ level low enough to interfere with blood clotting is incompatible with life. In vitro, clotting can be prevented if Ca 2+ is removed from the blood by the addition of substances such as oxalates or chelating agents.