The N-terminal a PAS domain 

a GAF domain with bilin-lyase activity, which binds the chromophore, 

PHY domain, which stabilizes phytochrome in the Pfr form

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#Id: 4778

#Unit 5. Developmental Biology

If the P2 cell is removed at the early 4-cell stage, the EMS cell will divide into two MS cells, and no endoderm will be produced.

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#Id: 4779

#Unit 5. Developmental Biology

In pop-1-deficient embryos, both EMS daughter cells become E cells.

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#Id: 4780

#Unit 5. Developmental Biology

Wnt pathway is critical in establishing the anterior-posterior axis of C. elegans.

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#Id: 4781

#Unit 5. Developmental Biology

The P2 cell is also critical in giving the signal that distinguishes ABp from its sister, ABa

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#Id: 4782

#Unit 5. Developmental Biology

ABa gives rise to neurons, hypodermis, & anterior pharynx cells ABp makes only neurons and hypodermal cells

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#Id: 4783

#Unit 5. Developmental Biology

ABa and ABp are equivalent cells whose fates are determined by their positions in the embryo (if one experimentally reverses the positions of these two cells, their fates are similarly reversed and a normal embryo forms)