6402
Ig - alpha and Ig - beta contain extended cytoplasmic structure ( 61 and 48 amino acids , respectively ) and associate with cytoplasmic effectors indicating that they are directly involved in signal transduction .
 Ig - alpha, Ig - beta
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 Ig - alpha, Ig - beta