Urochordata article 12 Animals 10 Oikopleura dioica 8 morphology 8 nonhuman 8 unclassified drug 8 zooplankton 8 Aplidium meridianum 6 Appendicularia (class) 6 Humans 6 Indole Alkaloids 6 Invertebrata 6 drug isolation 6 invertebrate 6 meridianin 6 Alkaloids 4 Animalia 4 Aplidium 4 Ascidia 4 Heritability 4 Individual variability 4 Life history traits 4 Meridianin 4 Mice 4 Salpidae 4 Tunicata 4 controlled study 4 drug structure 4 enzyme activity 4