Ca2+-influx after cAMP stimulation is reduced in regA- cells. The amount of influx (pmol/107 cells) after addition of 1 μM cAMP is plotted versus extracellular [Ca2+]. Average influx was higher in wild type than in regA- amoebae (mean ± s.d. from at least 6 determinations in 3 independent experiments each).
Lusche et al. BMC Cell Biology 2005 6:12 doi:10.1186/1471-2121-6-12