 releas free fatti acid adipos tissu newborn infant summari role plai mobil free fatti acid ffa adipos tissu produc typic high serum ffa level human infant studi ffa concentr serum subcuta- neou adipos tissu gluteal region determin postnat develop maximum level reach 24 hr birth gradual fall serum ffa level 12 month higher adult ffa level adipos tissu lower 3 month adult incub small piec adipos tissu kreb-ringer phosphat buffer 4 albumin led releas ffa medium releas suppress addit glucos 200 100 tissu ag group youngest 0-15 hr birth 