1. The transport of apoprotein B from the lipoproteins of plasma into the lipoproteins of lymph draining the foot has been studied in four men with type III hyperlipoproteinaemia.

2. Three subjects were given autologous 125I-labelled very-low-density lipoprotein (VLDL) and 131I-labelled low-density lipoprotein (LDL) by intravenous injection; the fourth was given autologous 125I-labelled VLDL and 131I-labelled intermediate-density lipoprotein (IDL) plus LDL.

3. The 125I/131I ratios in serum and lymph apoprotein B, and the 125I and 131I specific radioactivities of apoprotein B in VLDL, IDL and LDL from serum and lymph, indicate that apoprotein B in the circulating VLDL can reach peripheral lymph without the intermediacy of circulating LDL.

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