Some catechol compounds other than noradrenaline and adrenaline in brains

This report gives the evidence for statements (Montagu, 1957(Montagu, , 1959) ) that a basic catechol compound other than noradrenaline and adrenaline is present in considerable amounts in the brains of different animals, and that it is probably 3hydroxytyramine.Human brain contained, in addition, 3,4-dihydroxyphenylalanine and an acidic catechol compound.The presence of 3-hydroxytyramine in brain was also reported in 1957 by Carlsson, Rosengren, Bertler & Nilsson (see Bertler & Rosengren, 1959), and has since been confirmed by others (see the Discussion section).