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Recent studies using avian retrovirus - mediated introduction of oncogenes into a small subset of somatic mammary cells suggest that polyoma middle T antigen ( PyMT ) may also preferentially transform stem / progenitor cells .
 Anatomy: somatic mammary cells; Anatomy: stem / progenitor cells
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
 Entities: somatic mammary cells, stem / progenitor cells 
Answer:
 Anatomy: somatic mammary cells; Anatomy: stem / progenitor cells