719:292-298 ) discovered peaks in the magnetic field-dependent longitudinal relaxation rate ( 1/t1 ) of water protons of muscle tissue , cells , and dehydrated protein in the field range 0.5-5 mhz ( proton larmor frequency ) , and argued that the peaks resulted from cross relaxation associated with quadrupolar splittings of the 14n nuclei of protein nh groups .
C0007634
cells
C0007610
nuclei