tokens: 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 .
folded_tokens: bcr cross link also lead to increase mapk activate protein kinase-2 activity , a enzyme that lie immediately downstream from p38 mapk ; mapk activate protein kinase-2 immune complex phosphorylate a peptide substrate contain the creb serine 133 phosphoacceptor motif .