Antibodies . . . . . . are abundant in colostrum.

What are the characteristics of acquired immunity?

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.

Which of the following components is $NOT$ associated with the immune system?

Assertion: Interferons are a type of antibodies produced by body cells infected by bacteria.
Reason: Interferons stimulate inflammation at the site of injury.

Interferons are secreted by which of the following?