Antibodies are produced by

Assertion: Artificially acquired passive immunity results when antibodies or lymphocytes produced outside the host are introduced into a host.
Reason: $A$ bone marrow transplant given to a patient with genetic immunodeficiency is an example of artificially acquired passive immunity.

Where are $H_{2}L_{2}$ molecules found in the body?

$T$-Lymphocytes originate from

The immunity acquired by the fetus from the mother through the placenta or by the infant from mother's milk for a short period is known as:

Which type of innate immunity barrier is represented by the secretion of saliva from the mouth and tears from the eyes?