By scramblase, appearance of phosphatidylserine on the outer surface, act as “eat me” signal

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#Id: 1763

#Unit 4. Cell Communication and Cell Signaling

Peripheral tolerance, which renders some self-reactive lymphocytes in secondary lymphoid tissues inactive and generates others that actively inhibit immune responses against self

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#Id: 6706

#Unit 3. Fundamental Processes

There are two classes of snoRNPs involved in rRNA processing in nucleolus.  The box H/ACA snoRNPs are involved in pseudouridylylation, and box C/D snoRNPs function in 2-O-methylations.

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#Id: 4676

#Unit 13. Methods in Biology

Agglutination reactions are similar in principle to precipitation reactions they depend on the crosslinking of polyvalent antigens. Just as an excess of antibody inhibits precipitation reactions, such excess can also inhibit agglutination reactions; this inhibition is called the prozone effect.

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#Id: 8348

#Unit 2. Cellular Organization

The major NPF family is characterized by the presence of a region called WCA (WH2, connector, acidic)

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#Id: 7972

#Unit 10. Ecological Principles

Animal cells lack cell walls and do not experience turgor pressure.