During mammalian labor and delivery, the contraction of uterine muscles is enhanced partly by the actions of oxytocin. This is an example of

in 1972 the fluid—mosaic membrane model of membrane structure was proposed based on thermodynamic principals of organization of membrane lipids and proteins and available evidence of asymmetry and lateral mobility within the membrane matrix [s. j. singer and g. l. nicolson, science 175 (1972) 720–731].

if you add everything up correctly you should get 69 i got this because 50 plus 19 is it