Correction to: A comprehensive comparison of sex-inducing activity in asexual worms of the planarian Dugesia ryukyuensis: the crucial sex-inducing substance appears to be present in yolk glands in Tricladida

Following publication of the original article [1] the author advised that unfortunately in the ‘Discussion’ section the letters ‘L’ and ‘D’ in some ‘enantiomer’ expressions were not written in the format of ‘small capitals’. Rather, they were written as lower-case letters