If you ever played with a chemistry model set, Oxygen is usually coloured red, as it is in most diagrams. The reason being is that oxygen rich blood carries a lot of oxygen. Thus red has been chosen to represent oxygen. There are two white dots that represents the two carbons in the R-Group.
Along the hoist are two vertical stripes of white and green, which are coded to the letter D. The single letter abbreviation for Apartic Acid is D, while the three letter abbreviation is Asp. D is represented by the colour green since green and D are the fourth value of their respective orders. Green is the 4th colour of the rainbow and D is the fourth letter in the alphabet. The white stripe is a zero indicator to show that this is indeed letter, since letters in colour metrics are represented by two colours, which read as 04.
The Asp was discovered in 1827 by a wonder duo of two French scientists: Auguste-Arthur Plisson and Étienne Ossian Henry.
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