And as he watched the disease unfold, he was able to discover that actually the motor neurons were dying in the disease in a different way than the field had previously thought. There was another kind of cell that actually was sending out a toxin and contributing to the death of these motor neurons, and you simply couldn't see it until you had the human model.
À medida que ele assistiu ao desenvolvimento da doença, foi capaz de descobrir que, na verdade, os neurónios motores estavam a morrer de uma maneira diferente daquela que se pensava anteriormente. Havia um outro tipo de célula que estava a enviar uma toxina e a contribuir para a morte destes neurónios motores. Simplesmente não podíamos perceber isso até termos um modelo humano.