.. option::    --seeds seeds

        Seed sequences; either a fasta file containing seeds
        sequences (nucleic or proteic) or the name of an internal
        set of seeds among:

            - ``nucrRNAAHypogastrura``
            - ``nucrRNAArabidopsis``
            - ``protChloroArabidopsis``
            - ``protMitoCapra``
            - ``protMitoMachaon``
            
        .. code-block:: bash

          $ oa buildgraph --seeds protChloroArabidopsis seqindex

        A set of seed sequences must be or nucleic or proteic. For initiating
        assembling with both nucleic and proteic sequences you must use at least two 
        ``--seeds`` options one for each class of sequences.

        .. code-block:: bash

          $ oa buildgraph --seeds protChloroArabidopsis --seeds rDNAChloro.fasta seqindex

          