def rename_columns(df):
    """ Rename columns so that they are standardized for further analysis
    Parameters
    ----------
    df : pandas dataframe

    Returns
    -------
    df : pandas dataframe
    """

    df = df.rename(columns={'Protein Id': 'Uniprot_Id',
                            'proteinID': 'Uniprot_Id',
                            'Site Position': 'Site_Position',
                            'geneSymbol': 'Gene_Symbol',
                            'gene_symbol': 'Gene_Symbol',
                            'Gene Symbol': 'Gene_Symbol',
                            'motifPeptideStr': 'Motif',
                            'Localization score': 'Max_Score',
                            'Max Score': 'Max_Score'})
    return df