1519
We and others have previously shown that the nuclear protein , Ets-1 , is phosphorylated in a calcium-dependent manner after ligation of immunoglobulin (Ig) M on B lymphocytes .
 protein: immunoglobulin (Ig) M; protein: Ets-1; cell type: B lymphocytes; protein: nuclear protein
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: immunoglobulin (Ig) M; protein: Ets-1; cell type: B lymphocytes; protein: nuclear protein