The two ends of microfilament polymerize at different rates:

fast-growing end - plus end

slow-growing end - minus end

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The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z).

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During S phase and mitosis, 

Cdh1 is phosphorylated, Cdh1 dissociates from APC/C, and APC/C becomes inactive.

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Endoplasmic reticulum

Network of interconnected membranous structures within the cytoplasm of eukaryotic cells contiguous with the outer nuclear envelope.

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Histidine: Two component signalling, C2H2 zinc finger, Hemoglobin, His6-NiNTA column.

Isoleucine: AATS proofreading, RTK

Leucine: Toll like receptors, LRR, 

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A second NPF is a large protein complex called WAVE

and requires small GTP-binding protein Rac1.