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'sex': [93, 99, 221], 'differences': [94, 100, 222], 'contribute': [95], 'observed': [98, 132, 169], 'potency.': [103, 225], 'Using': [104], 'immunohistochemistry,': [105], 'we': [106], 'report': [107], 'males': [109, 144, 152, 196], 'had': [110], 'higher': [113], 'ventrolateral': [119, 160, 182, 212], 'cycling': [123], 'females,': [124], 'whereas': [125], 'lowest': [127], 'level': [128, 206], 'proestrus': [134, 171], 'females.': [135, 174], 'CFA-induced': [136], 'inflammatory': [137], 'pain': [138], 'produced': [139], 'thermal': [140], 'hyperalgesia': [141], 'both': [143], 'females': [146], 'reversed': [150], 'microinjection': [155], 'into': [158], 'PAG;': [161], 'this': [162, 199], 'effect': [163], 'greater': [166], 'than': [167], 'estrus': [173], 'Selective': [175], 'lesions': [176], 'neurons': [179], 'resulted': [184], 'significant': [187], 'reduction': [188, 200], 'effects': [191], 'systemic': [193], 'only,': [197], 'positively': [202], 'correlated': [203], 'PAG.': [213], 'Together,': [214], 'results': [216], 'provide': [217], 'mechanism': [219]}, 'cited_by_api_url': 'https://api.openalex.org/works?filter=cites:W2030867449', 'counts_by_year': [{'year': 2024, 'cited_by_count': 6}, {'year': 2023, 'cited_by_count': 19}, {'year': 2022, 'cited_by_count': 17}, {'year': 2021, 'cited_by_count': 20}, {'year': 2020, 'cited_by_count': 15}, {'year': 2019, 'cited_by_count': 9}, {'year': 2018, 'cited_by_count': 10}, {'year': 2017, 'cited_by_count': 3}, {'year': 2016, 'cited_by_count': 7}, {'year': 2015, 'cited_by_count': 4}, {'year': 2014, 'cited_by_count': 5}, {'year': 2013, 'cited_by_count': 13}, {'year': 2012, 'cited_by_count': 9}], 'updated_date': '2024-09-14T04:04:30.400148', 'created_date': '2016-06-24'}