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'immunoreactivity,': [136], 'but': [137], 'two': [139], 'immunoreactive': [140], 'clearly': [143], 'contained': [144], 'perikarya.': [147], 'overall': [149], 'elements': [153], 'brain': [157, 170], 'similarities': [159], 'proenkephalin‐derived': [164], 'previously': [166], 'reported': [167], 'for': [168], 'tetrapods.': [172], 'fact': [174], 'detected': [181], 'neurons,': [184], 'together': [185], 'absence': [188], 'dynorphin‐related': [190], 'peptides,': [191], 'suggests': [192], 'existence': [194], 'a': [196], 'novel': [197], 'Leu‐enkephalin‐containing': [198], 'precursor': [199], '©': [204], '1994': [205], 'Wiley‐Liss,': [206], 'Inc.': [207]}, 'cited_by_api_url': 'https://api.openalex.org/works?filter=cites:W2165709643', 'counts_by_year': [{'year': 2024, 'cited_by_count': 2}, {'year': 2022, 'cited_by_count': 1}, {'year': 2021, 'cited_by_count': 2}, {'year': 2020, 'cited_by_count': 3}, {'year': 2019, 'cited_by_count': 1}, {'year': 2017, 'cited_by_count': 1}, {'year': 2013, 'cited_by_count': 1}, {'year': 2012, 'cited_by_count': 3}], 'updated_date': '2024-08-16T10:46:50.243764', 'created_date': '2016-06-24'}