# Available genetic codes

In cases where a `cogent3` object method has a `gc` argument, you can just use the number under “Code ID” column.

For example:

We specify the genetic code, and that codons that are incomplete as they contain a gap, are converted to `?`.

## Getting a genetic code with `get_code()`

This function can be used directly to get a genetic code. We will get the code with ID 4.