Fig. 5From: Modifications in steroid and triterpenoid metabolism in Calendula officinalis plants and hairy root culture in response to chitosan treatmentContent of neutral triterpenoids (amyrins) (A) and free oleanolic acid and its methyl ester (B) in hairy roots tissue. C- control, CH- chitosan elicited samples. Bars which do not share a common letter are significantly different. Capital letters indicate significant difference in time between plants from the same treatment, lowercase indicate difference between treatments within certain time pointBack to article page