Hoffmann R J, Bishop S H, Sassaman C
J Exp Zool. 1978 Jan;203(1):165-70. doi: 10.1002/jez.1402030117.
Glutamate dehydrogenases detected in tissue extracts of a broad sample of coelenterate species all require NADP(H) as a co-substrate, rather than being capable of using either NAD(H) or NADP(H). In this respect, the coelenterate phyla appear to be unique in the animal kingdom.