‘First line of defence' is known as
Antibodies
WBC
Skin
Liver
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
Grafted kidney may be rejected in a patient due to
‘Pathogens' are
What would happen to immune system, if thymus gland is removed from the body of a person ?
After vaccination the body builds up