11617
Functional analysis of various PTP - deficient DT40 B cell lines stably expressing wild - type chimeric Fc gamma RIIB1 - PECAM - 1 receptor indicated that cytoplasmic Src homology 2 - domain - containing phosphatases , SHP - 1 and SHP - 2 , were both necessary and sufficient to deliver inhibitory negative regulation upon coligation of BCR complex with inhibitory receptor .
 PTP, Fc gamma RIIB1 - PECAM - 1 receptor, cytoplasmic Src homology 2 - domain - containing phosphatases, SHP - 1, SHP - 2, BCR complex
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 PTP, Fc gamma RIIB1 - PECAM - 1 receptor, cytoplasmic Src homology 2 - domain - containing phosphatases, SHP - 1, SHP - 2, BCR complex