1224
While no obvious transmembrane regions were identified , several short hydrophobic amino acid stretches were found to be localized in and around the Pro II region , and these may be responsible for attachment of precursors to membranes .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 None