Question: what do the letters str stand for as used in forensic science
[{'answer': 'short tandem repeats', 'provenance': [{'wikipedia_id': '6325086', 'title': 'STR analysis', 'start_paragraph_id': 1, 'start_character': 656, 'end_paragraph_id': 1, 'end_character': 676, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6325086', 'title': 'STR analysis', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 1242, 'bleu_score': 0.9321538655128551, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2611645404152566123}, 'section': 'Section::::Forensic uses.\n'}]}]