Vitamin A

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Vitamin A is otherwise known as retinol, which is an intermediary to retinal. or beta carotene. When it is in the form of retinal, this metabolite will act as a light absorbing molecule.

Vitamin A is also an essential component of retanoic acid which is a crucial signalling molecule especially during Early Organogenesis [2]

It is necessary for low light and colour vision, as it is found in the retina of the eye. Vitamin A is used in the treatment of Rhodopsin-related diseases. 

A defficiency of Vitamin A is known to cause night blindness due to its essential role in the ocular system of the body [1][2][3].

References

  1. Biochemistry 6th edition international edition by Lubert Stryer Jeremy Berg and John Tymoczko
  2. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1131442/
  3. http://www.cell.com/abstract/S0092-8674(08)01121-5