Plant material was provided by Botanical Garden of Freie Universitaet
Berlin (Germany). Samples were collected from the living
collection of the Botanical Garden. All plants were labeled, and with
the help of botanical expertise of the contributors, plant identification
could be confirmed. Latex was obtained by incising the
surface with a scalpel, and leaking latex was collected in phosphate
buffered saline (PBS) buffer. After collection the samples were
stored immediately at 4 C.