Euglenoids strains and culture conditions. The strains used in
this study are described in Table S1 (in the supplementary
material). All strains were cultivated in a liquid soil-water
medium, enriched with a small piece of a garden pea (medium
3c, Schlo¨sser 1994), under identical conditions in a growth
chamber maintained at 17C and 16:8 light:dark (L:D),
27 lmol photonsÆm)2Æs)1 provided by cool-white fluorescent
tubes.