Regardless of how many X chromosomes are present, all but one will be inactivated. 

In normal females there are of course two X chromosomes, but in rare cases where nondisjunction has generated a 3X or greater genotype, only one X chromosome remains active

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#Id: 1655

#Unit 4. Cell Communication and Cell Signaling

Series of concentration of antibodies present as GAMDE.

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#Id: 1584

#Unit 5. Developmental Biology

Primitive Streak; homologous to amphibian blastopore lip

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#Id: 9903

#Unit 4. Cell Communication and Cell Signaling

NOD1 also provides protection against the intracellular protozoan parasite Trypanosoma  cruzi,

NOD2 activates responses to some viruses, including influenza.

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#Id: 7207

#Unit 5. Developmental Biology

IL-4 increases expression of class II molecules in resting B cells, turning them into more efficient APCs.

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#Id: 10132

#Unit 6. System Physiology – Plant

PIN7 and PIN3 are thought to redirect auxin back into vascular parenchymal tissue, where polar transport takes place.