The cells which suppress the entire immune system from its attack in the same body are known as

Which of the following are phagocytic in nature?

Which of the following checks is $NOT$ required for organ transplantation?

Arrange the steps of the $phagocytosis$ process in the correct sequence.
$(a)$ Ingestion of microbes by phagocytes
$(b)$ Dilation of blood vessels by histamine
$(c)$ Formation of $phagosome$ and $phagolysosome$
$(d)$ Migration of phagocytes into $E.C.F.$
$(e)$ Attraction of phagocytes by $chemotoxins$ secreted by microbes
$(f)$ Intracellular destruction of bacteria

The immune system which works against self is

What is true about $T-lymphocytes$ in mammals?