Assertion: brown algae's cell wall | /r/MadeOf | carrageenan
Facets:
value: in red algae
type: LOCATION
Source sentences:
text: They have rigid cell walls containing agar or carrageenan, which are useful as food solidifying agents and as a solidifier added to growth media for microbes.
text: In Red algae, the cell wall contains phycocolloid agar and carrageenan.