Assertion: fibril | /r/HasProperty | embedded in stable stain/trehalose layer
Facets:
value: over the holes
type: LOCATION
Source sentences:
text: Sample grids for TEM were stained with 4% uranyl acetate in 1% aqueous trehalose followed by drying at 70% relative humidity to leave the fibrils embedded in a stable stain/trehalose layer over the holes.