Red seaweed or rhodophyta, Phylum
rhodophyta, is considered a much more
important source of biologically active
metabolites than other types of seaweed.
Its bioactive content includes sulfated
polysaccharides, vitamin C, amino acids,
peptides, fatty acids and proteins. Among
the bioactive proteins are two important
groups: lectines and phycobiliproteins.
The latter are found only in cyanobacteria
and red algae.