Fig. 3
From: Assessment of geographical origin and production period of royal jelly by NMR metabolomics
PCA score-plot (41.4% of total variance explained) based on 1H NMR spectra of Royal Jelly samples produced by two Bologna (Bo1 and Bo6, squares) and four Grosseto (Gr2, Gr3, Gr4 and Gr5, circles) farms on the 30th of May 2016. The ellipses and the red dotted line were generated arbitrarily to indicatively group the RJ types and introduce a separation axis between the Bologna and Grosseto RJ samples, respectively. The name and orthogonal direction of most significant loading vectors involved in the differentiation among RJ types are reported along the plot borders (more details are given in Additional file 1: Fig. S5)