The immunity obtained after the body has recovered from a disease is

Grafted kidney may be rejected in a patient due to

Where are $B\,-$ cells and $T\,-$ cells formed ? How do they differ from each other ?

A malfunction of the lymph nodes would most likely interfere with the

Each antibody has $...A...$ polypeptide chains, $...B...$ small chains called $....C...$ chains and $...D...$ longer chains called $.E...$ chains

The antibody, therefore, is represented as $...F...$

Here $A$ to $F$ refers to

Which of the following is not the main function of lymph glands