def getSequence(id, HP_df):
    """
    get the protein seq from the reference human prteome by given uniprot accession  
    
    Parameters
    ----------
    id : str
        protein uniprot accession
    HP_df : dataframe
        reference human prteome
        
    Returns
    -------
    seq: str
        protein sequence of given uniprot accession
    """
    try:
        seq = HP_df.loc[HP_df['UniprotID'] == id, 'sequence'].iloc[0]
    except:
        seq = ''  
        return seq  

    return seq