The SA node exhibits automaticity; it can spontaneously generate action potentials without neural input.

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#Id: 4736

#Unit 5. Developmental Biology

The zygote of C. elegans exhibits rotational holoblastic cleavage.

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#Id: 1059

#Unit 5. Developmental Biology

Tbx stands for “T-box,” a specific DNA-binding domain.

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#Id: 7787

#Unit 2. Cellular Organization

The wild-type form of large T-antigen is localized to the nucleus in virus-infected cells, whereas some mutated forms of large T-antigen accumulate in the cytoplasm.

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#Id: 9080

#Unit 4. Cell Communication and Cell Signaling

Binding of acetylcholine triggers the opening of an associated K+ channel  in the plasma membrane via the Gβγ subunit of a Gi protein

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#Id: 4749

#Unit 5. Developmental Biology

At the same time, the sperm microtubules induce the contraction of the actin-myosin cytoskeleton toward the anterior, thereby clearing PAR-3, PAR-6, and PKC-3 from the posterior of the 1-cell embryo.