You will be shown an abstract from a biomedical research paper. Given this abstract, your task is to extract all unique entities of the following types: ["AnatomicalEntity"].

Please return the output as a JSON object of the format: {"AnatomicalEntity": ["tumor cells", ...]}. The keys should be entity types and values should be lists of extracted entities belonging to the corresponding type. If you cannot find entities belonging to a specific type, the value should be [].

Only output the JSON object and do not include any additional text.

Abstract:

Acknowledgements
We thank Dr. Neva Meyer for confocal imaging and generation of Z-stack projection, and the following members of the Seaver lab for their continued support of this project: Dr. Neva Meyer, Dr. Aldine Amiel, and Tyler Smith. This work was supported by the National Science Foundation (REU Supplement of 10B05-44869 to E.C.S.).
{"AnatomicalEntity": []}