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A minor percentage of the population has a genetic mutation causing the loss of the characteristic "chin ridge", this is also known to happen among hybrids. Those without a chin ridge find it easier to grow facial hair, although it is possible for those without the mutation.<ref>[[Pholin Duyzer]] - genetic mutation with facial hair, [[Groznin Smith]] - hybrid without the chin ridge.</ref> | A minor percentage of the population has a genetic mutation causing the loss of the characteristic "chin ridge", this is also known to happen among hybrids. Those without a chin ridge find it easier to grow facial hair, although it is possible for those without the mutation.<ref>[[Pholin Duyzer]] - genetic mutation with facial hair, [[Groznin Smith]] - hybrid without the chin ridge.</ref> | ||
Denobulans have blue blood. Denobulans being descended from shelled oceanic invertebrates means their blood carries hemocyanin in the hemolymph fluid around the blood cells. This causes the blood to take on a light blue, matte hue | |||
==Psychology== | ==Psychology== |
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