Question: chemical signals that act from cell to cell are called
[{'answer': 'Juxtacrine', 'provenance': [{'wikipedia_id': '4109042', 'title': 'Cell signaling', 'start_paragraph_id': 11, 'start_character': 13, 'end_paragraph_id': 11, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Classification.\n'}]}, {'answer': 'Paracrine', 'provenance': [{'wikipedia_id': '4109042', 'title': 'Cell signaling', 'start_paragraph_id': 17, 'start_character': 365, 'end_paragraph_id': 17, 'end_character': 374, 'bleu_score': 1.0, 'section': 'Section::::Classification.\n'}]}, {'answer': 'Endocrine', 'provenance': [{'wikipedia_id': '4109042', 'title': 'Cell signaling', 'start_paragraph_id': 17, 'start_character': 118, 'end_paragraph_id': 17, 'end_character': 127, 'bleu_score': 1.0, 'section': 'Section::::Classification.\n'}]}]