9300
The dopamine D4 receptor as well as many other catecholaminergic receptors contain several putative SH3 binding domains .
 dopamine D4 receptor, catecholaminergic receptors, SH3 binding domains
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 dopamine D4 receptor, catecholaminergic receptors, SH3 binding domains