5303
The calcium indicator Fura - 2 was retained in these cells only in the presence of probenecid ( 1 mM ) , suggesting that Fura - 2 efflux was mediated by an organic anion transporter .
 Anatomy: cells
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
 Entities: cells 
Answer:
 Anatomy: cells