Assertion: cholesterol | /r/CreatedBy | the brain cells
Facets:
value: without the presence of this factor
type: OTHER
value: in a form
type: OTHER
Source sentences:
text: Scientists have discovered that synapse formation is almost entirely dependent on cholesterol, which is produced by the brain cells in a form called apolipoprotein E. Without the presence of this factor we cannot form synapses, and hence we would not be able to learn or remember anything.