Data Views Exclude Ubiquitous Chemicals Activities: 670 Chemicals w/Activities: 182 CSV Excel PDF All Chemicals: 252 Previous12345678910 Show all rows. Paginate rows. Click on column headings to sort table by that column # Activity Chemical Part All Bud Flower Leaf Plant Seed Stem Tissue Culture Low PPM High PPM StdDev *Reference 10 10 SQUALENE Plant -- -- * 4 4 BORON Stem -- 21.0 -0.74 * *Unless otherwise noted all references are to Duke, James A. 1992. Handbook of phytochemical constituents of GRAS herbs and other economic plants. Boca Raton, FL. CRC Press.