Activin is also produced by ovarian granulosa cells and stimulates FSH secretion.

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#Id: 7361

#Unit 5. Developmental Biology

On the left side of Hensen’s node, Sonic hedgehog (Shh) activates Cerberus, which stimulates BMPs to induce the expression of Nodal

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#Id: 9517

#Unit 6. System Physiology – Plant

During infection, most bacteria remain in extracellular spaces and use a specialized mechanism, the type III secretion system (T3SS), to deliver bacterial effector proteins into the plant cell

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#Id: 8708

#Unit 1. Molecules and their Interaction Relevant to Biology

This reaction is catalyzed by nucleoside diphosphate kinase

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#Id: 3056

#Unit 10. Ecological Principles

Larger populations are more resistant to extinctions.

Greater ranges of habitats promote increased speciation rates.

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#Id: 8032

#Unit 1. Molecules and their Interaction Relevant to Biology

Ornithine and citrulline, which are not found in proteins, are intermediates in the biosynthesis of arginine and in the urea cycle.