5586
The effect of site - specific mutations in the mouse platelet - derived growth factor ( PDGF ) beta - receptor on activation of the Na + / H + exchanger was examined in normal murine mammary gland epithelial ( NMuMG ) and Chinese hamster ovary ( CHO ) cells .
 GENE: mouse platelet - derived growth factor ( PDGF ) beta - receptor; GENE: Na + / H + exchanger
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities: mouse platelet - derived growth factor ( PDGF ) beta - receptor, Na + / H + exchanger 
Answer:
 GENE: mouse platelet - derived growth factor ( PDGF ) beta - receptor; GENE: Na + / H + exchanger