2) T h e luciferin from a luminous ostracod, Cypridina hilgendor6, has been assigned a tentative structure by Y. Hirata, 0. Shimomura, TO THE EDITOR Vol. s3

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For economy of hypothesis we exclude from consideration the model of double linker strands bridging DNA segments. DNA itself admirably fulfills the requirements of such linkers (such linkers would have to replicate, for instance) and it seems unnecessary to postulate an added complication without experimental justification.

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