Assertion: visual system's impact | /r/HasAspect | eventual finding
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Source sentences:
text: The largest impact on our understanding of visual capabilities in sharks came with the eventual finding that practically all sharks have duplex retinas containing both rod and cone photoreceptors (Gruber and Cohen, 1978), beginning with the unequivocal evidence of cones in the lemon shark (N. brevirostris) retina presented by Gruber et al. 1963.