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H. , E. , F. , and W. /. Tdr, We also thank Dr Sigurdson, Director of the Confocal Microscopy and 3- Dimensional Imaging Facility, School of Medicine and Biomedical Sciences, SUNY at Buffalo for help with microscopy and Sharon Willard for expert technical assistance. formation was measured by HPLC as described in Fig. 3. In panel C, the membrane microsomes were incubated in the presence or absence of PI-PLC for two h. The supernatant and membrane fractions were collected separately and then incubated with 14 C-labeled NAD + . ADPR production was measured by HPLC and results are presented as % activity compared to the non-treated membrane fraction. The specific activity of non-treated membrane microsomes was 36 nmol/min/mg protein. D, Adult S. mansoni worms express an outer membrane NAD + glycohydrolase. Ten live adult S. mansoni worms were placed in single wells of a 96 well plate and were incubated in media (circles) or media containing ?-NAD + (squares) and conversion of ?-NAD + to fluorescent ?-ADPR was measured in a microplate fluorometer and is reported in RFU vs time. E, Adult S. mansoni worms express a GPI-anchored outer tegument NADase. Ten live adult S. mansoni worms were placed in single wells of a 96 well plate and were then incubated in the presence (diamonds and triangles) or absence (squares and circles) of PI-PLC for 2 h, Support for this work was provided by Trudeau Institute, NIH grants AI-43629 and AI-057996 (FEL) and AI-46762 (PTL), the Centre National de la Recherche Scientifique The media from each of the wells was removed and then incubated in the presence (circles and triangles) or absence (squares and diamonds) of ?-NAD + . Production of fluorescent ?-ADPR was measured in a microplate fluorometer and is reported as RFU over time