Plant Biology. In the article “Convergent pathways for lipochitooligosaccharide and auxin signaling in tobacco cells” by Horst Röhrig, Jürgen Schmidt, Richard Walden, Inge Czaja, Helge Lubenow, Ursula Wieneke, Jeff Schell, and Michael John, which appeared in number 23, November 12, 1996, of Proc. Natl. Acad. Sci. USA (93, 13389–13392), the undersigned authors wish to note the following.

“Referring to Schell et al. [Schell, J., Bisseling, T., Dülz, M., Franssen, H., Fritze, K., John, M., Kleinow, T., Leßnick, A., Miklashevichs, E., Pawlowski, K. et al. (1999) Plant J. 17, 461–466], we confirm the irreproducibility of results described in the above paper by Röhrig, et al. regarding phytohormone-independent division of tobacco protoplasts. We apologize for any inconvenience that publication of this study may have caused.”Horst RöhrigJürgen SchmidtInge CzajaHelge LubenowUrsula WienekeJeff SchellMichael John