6941
In order to delineate structural motifs regulating substrate affinity and recognition for the human dopamine transporter ( DAT ) , we assessed [ 3H ] dopamine uptake kinetics and [ 3H ] CFT binding characteristics of COS - 7 cells transiently expressing mutant DATs in which the COOH terminus was truncated or substituted .
 GENE: human dopamine transporter; GENE: DAT; GENE: mutant DATs
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: human dopamine transporter, DAT, mutant DATs 
Answer:
 GENE: human dopamine transporter; GENE: DAT; GENE: mutant DATs