Fig. 1. ( A ) Representative trace depicting capacitative Ca2+entry after depletion of sarcoplasmic reticulum Ca2+stores with thapsigargin in pulmonary venous smooth muscle cells. Extracellular Ca2+was sequentially added and removed three times. (B ) Summarized data showing the reproducibility of capacitative Ca2+entry. The third capacitative Ca2+entry response was decreased (* P < 0.05) slightly compared with the first capacitative Ca2+entry response. n = 13 .