add additional string, corresponding to missing IDs to each table

This step makes me wonder if you have a defined and ordered list of values that a gene ID might have. This would have a significant bearing on how to approach the problem.

Perhaps you could clarify this point.

Cheers,

JohnGG

In reply to Re: Merging/Rearranging Tables by johngg
in thread Merging/Rearranging Tables by homeveg

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