Euphorbia lathyris L. plants were grown in a growth chamber under a long-day light regime at 24 °C during the light phase (16 h) and 20 °C during the dark phase (8 h). Seeds were germinated in standard garden soil for one month then seedlings of 20–30 cm in height were transferred into individual pots. Latex samples were collected through razor-blade transversal sections of stems starting from the apices to bottoms and every 10 cm to take advantage of the pressure in laticifers to drain the tissues as much as possible. Nicotiana benthamiana Domin. plants were grown in a standard soil mixture (Archut Fruhstorfer Erde®) in a growth chamber maintained under a long-day light regime (16 h light, 120 μmol photons m−2 sec−1).
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