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 .
 human dopamine transporter, DAT, mutant DATs
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 human dopamine transporter, DAT, mutant DATs