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What does this representation mean- R.L.[EQD]?

(a) An arginine- Amino acid- Leucine- Amino acid- Either Apartic acid, glutamic acid or glutamine

(b) An arginine- Leucine- Either Apartic acid, glutamic acid or glutamine

(c) An arginine- Leucine- Amino acid- Either Apartic acid, glutamic acid or glutamine

(d) An arginine- Leucine- Apartic acid and glutamic acid and glutamine

I have been asked this question during an online exam.

Enquiry is from Motif and Domain Databases Using Regular Expressions in chapter Sequence Alignment of Bioinformatics

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Correct option is (a) An arginine- Amino acid- Leucine- Amino acid- Either Apartic acid, glutamic acid or glutamine

For explanation I would say: This is an example of pexel motif. Here, the ‘.’ represents the ‘end’ i.e. the amino acid as mentioned in the answer and the [ ] means ‘or’ i.e. either of the mentioned residue is present in the given position.

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