“…The prime experimental approach we use in these studies is protein CIDNP spectroscopy (photochemically induced dynamic nuclear polarization) (see, e.g., Muszkat, 1977;Muszkat et al, , 1982Muszkat et al, , 1983Muszkat et al, , 1984aBerliner and Kaptein, 1981;Berliner et al, 1990), which provides detailed structural and accessibility information, and ensures enhanced sensitivity specific for the CIDNP active side chains. Myotoxin a damages the sarcoplasmic reticulum (SR) membrane by associating with its two components, the Ca 2 § ATPase and the 53GP glycoprotein (Volpe et al, 1986;Utaisincharoen et al, 1991;Tu et al, 1992).…”