2205
To assess the functional importance of these NBS in the overall drug resistance phenotype conferred by mdr1 , we introduced amino acid substitutions in the core consensus sequence for nucleotide binding , GXGKST .
 mdr1
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 mdr1