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We show here that proerythroblasts and mature erythroid cells contain a diffusible activity ( TAG ) capable of transcriptional activation of GATA-1 and that this activity decreases during the terminal differentiation of erythroid cells .
 protein: GATA-1; cell type: proerythroblasts; cell type: mature erythroid cells; cell type: erythroid 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: GATA-1, proerythroblasts, mature erythroid cells, erythroid cells 
Answer:
 protein: GATA-1; cell type: proerythroblasts; cell type: mature erythroid cells; cell type: erythroid cells