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Four of 6 cases tested showed functional NK cell-mediated cytotoxicity , suggesting a relationship between these unique CD33+, CD56+, CD16 -acute leukemias and normal CD56+, CD16- NK precursor cells .
 protein: CD16; cell type: normal CD56+, CD16- NK precursor cells
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: CD16, normal CD56+, CD16- NK precursor cells 
Answer:
 protein: CD16; cell type: normal CD56+, CD16- NK precursor cells