The significance of this discovery is not to be underestimated.
I would have supposed it occurred much earlier. To put things in context, 1973 is the year I graduated high school. So maybe that’s about right.
This opened the door to study of the whole world of receptors, with many important developments. Discovery of the serotonin receptors was key to invention of the medicines now most widely prescribed, and most successful, for treatment of depression and obsessive-compulsive disorder. Discovery of the insulin receptors has wholly changed research into diabetes.
At least from its Amazon page, Everything You Need to Know to Feel Go(o)d seems to deserve attention.