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: ["RNA", "CellLine", "Protein", "DNA", "CellType"].

Please return the output as a JSON object of the format: {"DNA" : ["TAL1", ...], "RNA": ["mRNAs", ...], "CellLine": ["T cells", ...], "CellType": ["monocytes", ...], "Protein": ["IL-2", ...]}. 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:

Calcitriol: a hematolymphopoietrope? [ editorial ] A MEDLINE search of the English-language literature was conducted using the indexing terms 'immunology, calcitriol and vitamin D' to identify studies indicating a role for calcitriol as a primary immunomodulator. Sixty-six papers published between January 1956 and June 1991 were identified. Forty-five of these reports are cited in this review. The data strongly suggest an endocrine, autocrine and / or paracrine role for calcitriol in immune regulation. No unifying hypothesis has yet emerged explaining this collection of data. This paper provides a brief review of immune properties currently attributed to calcitriol.
{"CellLine": [], "CellType": [], "DNA": [], "Protein": [], "RNA": []}