Beta sheets usually have their B strands either parallel or antiparallel

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#Unit 3. Fundamental Processes

DNA methylation and macroH2A contribute to the stable repression of the inactive X chromosome  A. Wutz and J. Gribnau, Curr. Opin. Genet. Dev. 17 (2007): 387–393. inactive specific transcript), which is stably expressed only on the inactive X chromosome.

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#Unit 6. System Physiology – Plant

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#Id: 6794

#Unit 3. Fundamental Processes

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#Id: 2591

#Unit 13. Methods in Biology

Touchdown  PCR is initiated at very high annealing temperatures, which allow only perfectly matched primer-template DNA hybrids to form and support amplification. The annealing temperature is dropped in a stepwise fashion with each cycle of PCR. 

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#Unit 4. Cell Communication and Cell Signaling

C8 is made up of two peptide chains: C8β and C8αϒ. 

Binding of C8β to the C5b67 complex induces a conformational change in the C8 dimer such that the hydrophobic domain of C8αϒ can insert into the interior of the phospholipid membrane.