In anatomy the term "reticuloendothelial system" (abbreviated RES), often associated nowadays with the  mononuclear phagocyte system (MPS), was originally launched by the beginning of the 20th century to denote a system of specialized cells that effectively clear colloidal vital stains (so called because they stain living cells) from the blood circulation.

1. RETICULOENDOTHELIAL SYSTEM
In anatomy the term
"reticuloendothelial system"
(abbreviated RES), often associated
nowadays with the
mononuclear phagocyte
system (MPS), was originally launched
by the beginning of the 20th century
to denote a system of specialised cells
that effectively clear colloidal vital
stains (so called because they stain
living cells) from the blood circulation.

5. (Eats dead cells in the body)