Assertion: liquid nitrogen | /r/HasProperty | invaluable
Facets:
value: in the microbiology laboratory
type: LOCATION
value: for preserving blood
type: PURPOSE
Source sentences:
text: Liquid nitrogen is invaluable for preserving blood and bone marrow cells, sperm, ova, early embryos, and, in the microbiology laboratory, a variety of microorganisms (bacteria, fungi, etc).