“…Our observed value for ATP is about 20 times that reported for rabbit skeletal muscle ATPase (Barman, 1969) and approx. 40% of the value observed for rat cardiac myosin ATPase (McCarl et al, 1969). Direct comparison of the value calculated for the Km for Ca2+ is not possible owing to the lack of a published value; however, an approximate Km of 2.8 x 10-5M has been calculated from data presented by Weber & Portzehl (1954).…”