# Select named sequences from a collection

Let’s load alignment of primates to use in examples.

## Selecting sequences from a collection

Using the `take_named_seqs` app we can select sequences from a collection that match provided names. For instance, we could be interested in an alignment of sequences from Humans with those from our two closest relatives.

## Using `take_named_seqs` in a composed app process

## Removing sequences from a collection

Creating the `take_named_seqs` app with the argument `negate=True` will exclude sequences that match the provided names. For instance, perhaps the Galago has got to go.

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Sample nucleotides from a given codon position

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Select n sequences from a collection