whereas phosphorylated p26 was detected in the tnf-sensitive breast cancer cell line crl1500 , other tnf-responsive tumor cell lines investigated lacked enhanced phosphorylation of p26 in response to tnf , indicating that the 26-kda phosphoprotein ( pp26 ) may be a cell type-specific second messenger molecule involved in tnf signal transduction in some , but not all , target cells .
C0007634
cell type
C0037083
signal transduction