Another variant of the question is: When should you not use Clustal or MUSCLE in DNA sequence alignment. 

I am working on the 16S rRNA region of freshwater crabs (one family). I currently have 21 samples being aligned, which are around 500 bp each. I am constructing phylogenetic trees (NJ, MP and ML) along with chosen outgroup/s from ncbi. 

Your help will be greatly appreciated.

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