the development of the concentrative capacity can be accelerated by the friend cell inducer hexamethylene bisacetamide ( hmba ) and by the phosphodiesterase inhibitors dibutyryl camp , theophylline , and 1-methyl-3-isobutylxanthine ( mix ) .
C0039771
theophylline
C0000096
1-methyl-3-isobutylxanthine