Turn the sentence around and then the statement becomes true. You tell me you are beginning to worry about what information is most important in our course. There have been many new words for you to learn. New words that are most important are words like these, and like synapomorphy, that embody big concepts on which we focus in the course. This is the title of a recent article by Zhu et al.
E.g. blood is a ventral mesodermal cell fate vs. notochord is a dorsal mesodermal fate.
Where chordin is expressed, BMP activity is inhibited, and ventral mesodermal development is inhibited. The title connects study of development with the clinic. Learning about the genetic regulatory pathways that control development cannot only show us how evolution happened. This knowledge can also show us how cancer happens. On the other hand the dorsal and ventral sides differ.