the ratio of the concentration of the principal circulating metabolite of prostaglandin f ( 13 , 14-dihydro-15-ketoprostaglandin f ) to prostaglandin f itself is low ( 0.3 to 0.5 , compared with 15.8 in adult plasma ) , implying that prostaglandins may have a relatively long half-life in milk .
C0033561
f
C0033554
prostaglandins