saber964 wrote:Yes and No. 'Cats like celery from anywhere but only the gen-mod Sphinxian celery has the 'vitamin' which was modified by Marjory Harrington. Also Dr. Harington was modifying another plant that may have the 'vitamin' namely the 'Purple Star' in Fire Season which was (speculatively) a cross of Purple Thorn and a Star Fruit.
The way I read it, "Purple Star" was the human name for what treecats called "Purple Thorn", and Dr. Harrington was using "Purple Star" DNA to modify the celery, unintentionally including whatever mechanism "Purple Star" uses to produce/concentrate the telepath nutrient.