The Rhodopsin-rrtinochr~t~te system is essential for the visual photoreception of molluscs. cDNA coding for retinochrome of the squid (Todurode.v puctficu.v) was cloned and the nucleotide sequence has been determined. The sequence (2.1 kb) covers the whole coding region of 903 bp. The deduced primary sequence suggests that ret&chrome contains seven transmembrnne spanning domams. 'The homology with bovine rhodopsin and the possible retinal binding site are also discussed.
We demonstrate that the celebrated Kullback information (contrast) provides the measure of the shortest binary string by which a statistical system can be described. This measure is based on Shannon information. For Lorentzian information (entropy) the string will always be longer under otherwise same conditions. Kullback information provides a direct link between Shannon and Lorentzian informations.
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