Assertion: fern's root | /r/MadeOf | sac-like structures
Facets:
Source sentences:
text: The roots contain sac-like structures that release organic and organosulfur compounds including SO 2 , methylsulfinic acid, pyruvic acid, lactic acid, ethanesulfinic acid, propane sulfinic acid, 2-mercaptoaniline, S-propyl propane 1-thiosulfinate, and thioformaldehyde, an elusive and highly unstable compound never before reported to be emitted by a plant.