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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#Unit 4. Cell Communication and Cell Signaling

Four genes play an essential role in controlling apoptosis during C. elegans development: 

ced-3, ced-4, ced-9, and egl-1

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#Unit 4. Cell Communication and Cell Signaling

STAT homodimer has two phosphotyrosine-SH2 domain interactions

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#Unit 2. Cellular Organization

Membrane contact sites (MCSs)

Mitochondria establish MCSs with many other organelles, including ER, lysosomes, peroxisomes, the plasma membrane, the Golgi, endosomes, and even lipid droplets.

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#Unit 3. Fundamental Processes

Nirenberg and Matthaei therefore concluded that the triplet codon UUU encodes phenylalanine, poly(C) proline (polyproline), polyadenylate, poly(A), encodes polylysine.

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#Unit 4. Cell Communication and Cell Signaling