negatively regulates phosphatidylserine biosynthetic process biological regulation negative regulation of phospholipid biosynthetic process regulation of phosphatidylserine biosynthetic process negative regulation of phosphatidylserine biosynthetic process down regulation of phosphatidylserine anabolism downregulation of phosphatidylserine biosynthetic process downregulation of phosphatidylserine formation 2012-05-01T08:01:11Z negative regulation of phosphatidylserine formation downregulation of phosphatidylserine anabolism dgf negative regulation of phosphatidylserine biosynthesis inhibition of phosphatidylserine biosynthetic process inhibition of phosphatidylserine biosynthesis biological_process inhibition of phosphatidylserine formation inhibition of phosphatidylserine anabolism down regulation of phosphatidylserine biosynthesis Any process that stops, prevents or reduces the frequency, rate or extent of phosphatidylserine biosynthetic process. GO:1900469 down regulation of phosphatidylserine formation down-regulation of phosphatidylserine biosynthesis down-regulation of phosphatidylserine anabolism downregulation of phosphatidylserine synthesis down-regulation of phosphatidylserine formation negative regulation of phosphatidylserine synthesis down regulation of phosphatidylserine synthesis down-regulation of phosphatidylserine biosynthetic process inhibition of phosphatidylserine synthesis negative regulation of phosphatidylserine anabolism downregulation of phosphatidylserine biosynthesis down regulation of phosphatidylserine biosynthetic process down-regulation of phosphatidylserine synthesis