Retinoic acid is a noun for a derivative of vitamin A. That is the definition and it's also a sentence for retinoic.
Retinoic acid
Blindness develops as retinoic acid cannot be converted to retinal, which participates in vision.
Vitamin A1 acid which is used topically to treat acne
Look for ingredients such as retinol, retinal, retinoic acid or retinyl palmitate.
Mary Francesca Shago has written: 'The retinoic acid response'
Light energy strikes the cornea and excites pigments to release retinoic acid
i do not know how to use embalming in a sentence. (there is the sentence)
So- you are asking when to use 'when' in a sentence. When you are asking how to use when in a question, you are already using when in a sentence, because a question actually is a sentence. I like to use when in a sentence whenever I like.
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