altered cellular calcium level abnormal immediate intracellular calcium spike following extracellular calcium stimulus A cell phenotype observed in the vegetative growth phase of the life cycle in which the intracellular calcium ion (Ca2+) concentration briefly increases abnormally, or does not change, immediately following an extracellular Ca2+ stimulus. Normally, the intracellular Ca2+ concentration increases to a peak in a "burst" within one minute, and then decreases to a new steady-state concentration. abnormal immediate intracellular calcium spike following extracellular calcium stimulus during vegetative growth 2012-08-29T14:59:29Z FYPO:0001463 abnormal immediate intracellular calcium spike following extracellular calcium stimulus during mitotic cell cycle midori