The lymphatic system is collectively referred to as MALT. MALT stands for Mucosa Associated Lymphoid Tissue. One of their functions is to prevent the bacteria from breaching the intestinal wall.
Malt shop
Fats, oilds, waxes, and steroids are collectively called lipids
They are collectively called "vertebrates".
They were called legionnaires collectively
Collectively they are called 'tread'.
A coral
Does.
gate !
They were simply called "convicts".
the essays collectively are called "the Federalist"
Cells