Self antigens are not uncommon in the periphery, Two factors contribute to this:                                                                                                                             a. not all self a. antigens are expressed in the central lymphoid organs where negative selection occurs

b. there is a threshold requirement for affinity to self antigens before clonal deletion is triggered, allowing some weakly self-reactive clones to survive the weeding-out process.

TLS Online TPP Program

#Id: 3049

#Unit 10. Ecological Principles

Number of species of plants on island per year

TLS Online TPP Program

#Id: 6934

#Unit 8. Inheritance Biology

Chromosome inversion, in which a chromosome segment is inverted—turned 180 degrees.

TLS Online TPP Program

#Id: 4883

#Unit 13. Methods in Biology

If p > 0.01 and p ≤ 0.05, then there must be a strong assumption about the null hypothesis.

TLS Online TPP Program

#Id: 9413

#Unit 11. Evolution and Behavior

An individual without gonads will leave no genes to the next generation. Gonads and genitalia are called primary sexual traits.

Secondary sexual traits, which differ between the sexes but do not play a direct role in reproduction.

TLS Online TPP Program

#Id: 1939

#Unit 4. Cell Communication and Cell Signaling

Receptors that bind complement components