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Topic: Pentachromat

	Reference.com/Encyclopedia/Pentachromacy
		In practice the number of such receptor types may be greater than five, since different types may be active at different light intensities.
		Some birds and butterflies have five or more kinds of color receptors in their retinae, and are therefore believed to be pentachromats, though psychophysical evidence of functional pentachromacy is not easy to come by.
		As with tetrachromacy, it is suggested that women carriers of genes for both mild forms of color blindness, deuteranomaly and protanomaly, are born with five different types of color-sensing cones though the red- and green-deficient cones are later lost.
	www.reference.com /browse/wiki/Pentachromat (214 words)

	Pentachromat (Site not responding. Last check: 2007-10-26)
		A pentachromat is an organism for which the perceptual effect of any arbitrarily chosen light from its visible spectrum can be matched by a mixture of no more than five different pure spectral lights.
		The normal explanation of pentachromacy is that the organism's retina contains five types of cone cells with different absorption spectra.
		Some birds and butterflies have five or more kinds of colour receptors in their retinae, and are therefore believed to be pentachromats, though psychophysical evidence of functional pentachromacy is not easy to come by.
	omniknow.com /common/wiki.php?in=en&term=Pentachromat (1739 words)

	Color vision Summary
		Brightly colored oil droplets inside the cones shift the spectral sensitivity of the cell.
		(Some species of bird such as the pigeon in fact possess five distinct types of droplet and may thus be pentachromats).
		Mammals other than primates generally have less effective two-receptor color perception systems, allowing only dichromatic color vision; marine mammals have only a single cone type and are thus monochromats.
	www.bookrags.com /Color_vision (2052 words)

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