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'occupy': [124], 'matrix': [126], 'between': [127], 'ectoderm': [129], 'endoderm.': [131], 'This': [132], 'review': [133, 207], 'will': [134], 'focus': [135, 204], 'on': [136], 'classic': [138], 'example': [139], 'EMT,': [142], 'occurs': [144], 'sea': [147, 200, 210], 'urchin': [148, 211], 'primary': [151], '(PMCs)': [154], 'ingress': [155], 'vegetal': [158], 'plate': [159], 'this': [161, 206], 'embryo': [162, 182], 'precociously': [163], 'advance': [166], 'archenteron': [168], 'invagination.': [169], 'Because': [170], 'ingression': [171, 194], 'precisely': [173, 178], 'timed,': [174], 'PMC': [176], 'lineage': [177], 'known,': [179], 'easily': [183], 'manipulated,': [186], 'much': [187], 'has': [188], 'been': [189], 'learned': [190], 'about': [191], 'how': [192], 'PMCs': [196], 'works': [197], 'urchin.': [201], 'Though': [202], 'PMCs,': [212], 'evidence': [215], 'share': [219], 'many': [220, 230], 'common': [221], 'features': [222], 'at': [223], 'both': [224], 'cellular': [225], 'molecular': [227], 'levels,': [228], 'these': [232], 'mechanisms': [233], 'also': [235], 'shown': [236], 'be': [238], 'involved': [239], 'tumor': [241], 'progression,': [242], 'especially': [243], 'metastasizing': [244], 'carcinomas.': [245], 'Birth': [246], 'Defects': [247], 'Research': [248], '(Part': [249], 'C)': [250], '81:241–252,': [251], '2007.': [252], '©': [253], '2008': [254], 'Wiley‐Liss,': [255], 'Inc.': [256]}, 'cited_by_api_url': 'https://api.openalex.org/works?filter=cites:W1999834438', 'counts_by_year': [{'year': 2024, 'cited_by_count': 1}, {'year': 2023, 'cited_by_count': 1}, {'year': 2022, 'cited_by_count': 3}, {'year': 2021, 'cited_by_count': 3}, {'year': 2020, 'cited_by_count': 3}, {'year': 2019, 'cited_by_count': 1}, {'year': 2018, 'cited_by_count': 4}, {'year': 2017, 'cited_by_count': 5}, {'year': 2016, 'cited_by_count': 1}, {'year': 2015, 'cited_by_count': 4}, {'year': 2014, 'cited_by_count': 5}, {'year': 2013, 'cited_by_count': 3}, {'year': 2012, 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