10594
BCR cross - linking also led to increased MAPK - activated protein kinase - 2 activity , an enzyme that lies immediately downstream from p38 MAPK ; MAPK - activated protein kinase - 2 immune complexes phosphorylated a peptide substrate containing the CREB serine 133 phosphoacceptor motif .
 BCR, MAPK, protein kinase - 2, p38 MAPK, MAPK, protein kinase - 2, CREB serine 133 phosphoacceptor motif
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 BCR, MAPK, protein kinase - 2, p38 MAPK, MAPK, protein kinase - 2, CREB serine 133 phosphoacceptor motif