def parse_encode_donor(data):
    """Parse a python dictionary containing
    ENCODE's donor metadata into a dictionary 
    with select donor metadata
    
    :param data: python dictionary containing ENCODE' donor metadata
    :type s: dict

    :return: dictionary with parsed ENCODE's donor metadata
    :rtype: dict
    """
    keys_donor = ['accession', 'dbxrefs', 'organism', 'sex', 'life_stage', 'age', 'age_units', 'health_status', 'ethnicity']
    donor = {key: data.get(key, '') for key in keys_donor}
    return donor