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[LAB MOUSE]

I have been looking at some primer sequences for cyanobacteria and I have noticed that they contain 'R' and 'Y' see below. I work mainly with human work and I wondered if someone can explain the differences as I have never come across this.

ACGGGTGAGTAACRCGTRA
CTTCAYGYAGGCGAGTTGCAGC

I would appreciate if anyone can clarify as I am sure there is a simple explanation

Thanks in advance.

LM

[mdfenko]

they are ambiguity codes

y=c or t

r=a or g