Comment on

• Absence of toxicity of Bacillus thuringiensis pollen to black swallowtails under field conditions.

  Wraight CL, Zangerl AR, Carroll MJ, Berenbaum MR. Wraight CL, et al. Proc Natl Acad Sci U S A. 2000 Jul 5;97(14):7700-3. doi: 10.1073/pnas.130202097. Proc Natl Acad Sci U S A. 2000. PMID: 10840067 Free PMC article.
• Effects of exposure to event 176 Bacillus thuringiensis corn pollen on monarch and black swallowtail caterpillars under field conditions.

  Zangerl AR, McKenna D, Wraight CL, Carroll M, Ficarello P, Warner R, Berenbaum MR. Zangerl AR, et al. Proc Natl Acad Sci U S A. 2001 Oct 9;98(21):11908-12. doi: 10.1073/pnas.171315698. Epub 2001 Sep 14. Proc Natl Acad Sci U S A. 2001. PMID: 11559837 Free PMC article.
• Temporal and spatial overlap between monarch larvae and corn pollen.

  Oberhauser KS, Prysby MD, Mattila HR, Stanley-Horn DE, Sears MK, Dively G, Olson E, Pleasants JM, Lam WK, Hellmich RL. Oberhauser KS, et al. Proc Natl Acad Sci U S A. 2001 Oct 9;98(21):11913-8. doi: 10.1073/pnas.211234298. Epub 2001 Sep 14. Proc Natl Acad Sci U S A. 2001. PMID: 11559838 Free PMC article.
• Assessing the impact of Cry1Ab-expressing corn pollen on monarch butterfly larvae in field studies.

  Stanley-Horn DE, Dively GP, Hellmich RL, Mattila HR, Sears MK, Rose R, Jesse LC, Losey JE, Obrycki JJ, Lewis L. Stanley-Horn DE, et al. Proc Natl Acad Sci U S A. 2001 Oct 9;98(21):11931-6. doi: 10.1073/pnas.211277798. Epub 2001 Sep 14. Proc Natl Acad Sci U S A. 2001. PMID: 11559839 Free PMC article.
• Corn pollen deposition on milkweeds in and near cornfields.

  Pleasants JM, Hellmich RL, Dively GP, Sears MK, Stanley-Horn DE, Mattila HR, Foster JE, Clark P, Jones GD. Pleasants JM, et al. Proc Natl Acad Sci U S A. 2001 Oct 9;98(21):11919-24. doi: 10.1073/pnas.211287498. Epub 2001 Sep 14. Proc Natl Acad Sci U S A. 2001. PMID: 11559840 Free PMC article.
• Monarch larvae sensitivity to Bacillus thuringiensis- purified proteins and pollen.

  Hellmich RL, Siegfried BD, Sears MK, Stanley-Horn DE, Daniels MJ, Mattila HR, Spencer T, Bidne KG, Lewis LC. Hellmich RL, et al. Proc Natl Acad Sci U S A. 2001 Oct 9;98(21):11925-30. doi: 10.1073/pnas.211297698. Epub 2001 Sep 14. Proc Natl Acad Sci U S A. 2001. PMID: 11559841 Free PMC article.
• Impact of Bt corn pollen on monarch butterfly populations: a risk assessment.

  Sears MK, Hellmich RL, Stanley-Horn DE, Oberhauser KS, Pleasants JM, Mattila HR, Siegfried BD, Dively GP. Sears MK, et al. Proc Natl Acad Sci U S A. 2001 Oct 9;98(21):11937-42. doi: 10.1073/pnas.211329998. Epub 2001 Sep 14. Proc Natl Acad Sci U S A. 2001. PMID: 11559842 Free PMC article.