Reema Narendran |THIRUVANANTHAPURAM: Without a thought to the human effort, time and money put into its validation, two tribal medicines developed in the state are disappearing into nothingness, while multinational pharma companies walk away with the patents and trademark rights. On the one hand is Jeevani, which has already lost its trademark rights and all set to lose the patent too and on the other side is the scientifically validated drug for diabetes from `Chembravally