4967
Epidermal growth factor ( EGF ) binds with high affinity and specificity to a single site on the external domain of its transmembrane receptor to activate the tyrosine protein kinase activity of its cytoplasmic portion .
 transmembrane, cytoplasmic
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 transmembrane, cytoplasmic