however , the opioid peptide enkephalin [ d-ala2 , d-leu5 ] , which inhibits ganglioside galnac transferase activity in unsynchronized ng108-15 cultures , was much more inhibitory in whole cells 8 h after release from the cell cycle block ( g1 phase ) than in cells 20 h after release ( g2 phase ) , with 50 % inhibition occurring at 2 x 10 ( -9 ) m and 2 x 10 ( -7 ) m , respectively .
C0007634
cells
C0079396
g2 phase