1. Kansas Lipidomics Research Center; Division of Biology; Kansas State University; Manhattan KS 66506 USA
2. Department of Statistics; Kansas State University; Manhattan KS 66506 USA
3. Department of Biology; University of Missouri; St. Louis MO 63121 USA
4. Donald Danforth Plant Science Center; St. Louis MO 63132 USA
5. Department of Biological Sciences; University of North Texas; Denton TX 76203 USA
6. Waters Corporation; 34 Maple Street Milford MA 01757 USA
7. Mass Spectrometry Laboratory; University of Kansas; Lawrence KS 66045 USA