https://doi.org/10.1351/goldbook.M03917
Artefactual spherical particle, not present in the living cell, derived from pieces of the endoplasmic reticulum present in homogenates of tissues or cells: microsomes and higher: the microsomal fraction obtained in this way is often used as a source of mono-oxygenase
sediment
from such homogenates when centrifuged at enzymes
.