@staticmethod
def dict_initialise(metadata, analysistype):
    """
        Initialise dictionaries for storing DNA and amino acid sequences
        :param metadata: Metadata object
        :param analysistype: Current analysis type
        :return: Updated metadata
        """
    for sample in metadata:
        sample[analysistype].dnaseq = dict()
        sample[analysistype].protseq = dict()
        sample[analysistype].ntindex = dict()
        sample[analysistype].aaindex = dict()
        sample[analysistype].ntalign = dict()
        sample[analysistype].aaalign = dict()
        sample[analysistype].aaidentity = dict()
    return metadata
