mammalian cells in culture were exposed to cyclic amp , dibutyryl cyclic amp , the phosphodiesterase inhibitor caffeine , or a combination of the last two , while junctional molecular transfer was probed with the series of microinjected , fluorescent-labelled linear molecules glu , glu-glu , glu-glu-glu , and leu-leu-leu-glu-glu .
C0001455
cyclic amp
C0012054
dibutyryl cyclic amp