The protozoon can be ‘cured’ of its endosymbiote with penicillin4,5. It was suggested that the endosymbiote furnishes lysine and probably other metabolites to the protozoon, ...

The composition of fatty acids of the protozoon Ochromonas danica has been investigated by us. Nature - Occurrence of Arachidonic and Related Acids in the Protozoon Ochromonas danica.

This article was originally published with the title “ The Embryologist and the Protozoon ” in Scientific American Magazine Vol. 188 No. 3 (March 1953), p. 76 doi:10.1038 ...