Question: where do the amino acids come from in protein synthesis
[{'answer': 'tRNA molecules', 'provenance': [{'wikipedia_id': '24553', 'title': 'Protein biosynthesis', 'start_paragraph_id': 3, 'start_character': 38, 'end_paragraph_id': 3, 'end_character': 52, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '24553', 'title': 'Protein biosynthesis', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 711, 'bleu_score': 0.9622032542074631, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10081159000298838604}, 'section': 'Section::::Abstract.'}]}]