passages.id: split_1_test_3553_passage
passages.type: progene_text
passages.text: In HeLa cells , transiently expressed epitope - tagged RLPK can be strongly induced by epidermal growth factor , serum , and phorbol 12-myristate 13-acetate , but only moderately up - regulated by tumor necrosis factor - alpha and other stress - related stimuli .