Word: paramecin
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Dates: during 1948-1948
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...paramecium is a minute one-celled animal which multiplies both non-sexually (by simple division) and by a kind of primitive pairing. Several years ago, Dr. Sonneborn discovered that special strains of paramecia give off a poison (paramecin) that kills normal paramecia. The "killers" differ from the "sensitives" in only one known respect: the amount of a substance called "kappa" which they contain...
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