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High - affinity Potassium Transporters ( HKTs ) belong to an important class of integral membrane proteins ( IMPs ) that facilitate cation transport across the plasma membranes of plant cells .
 Chemical: Potassium
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Potassium