89 samples (82 species) of marine algae of French Atlantic coast have been investigated in vitro for their potential.antimitotic properties, by vegetable tissue culture technique (inhibition of Helianthus tuberosus growth). For each sample, three extracts, prepared with E t 2 0 , then EtOH 99 %, then H 2 0 , have been tested. Some of the most interesting extracts have also been examinated in vitro by "Helianthus tuberosus test-disc", by crown-gall tissue culture technique, and for their cytotoxicity on KB-cells and for their antimetabolite properties. Results are discussed.
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