Haptoglobin-related protein (HPR)

Primate-specific plasma protein associated with apolipoprotein L-I (apoL-I)-comprising high-density lipoprotein (HDL). This HDL particle, termed trypanosome lytic factor-1 (TLF- 1), mediates human innate immune protection against several species of African trypanosomes.

Binds hemoglobin with high affinity and may contribute to the lack of cell-free hemoglobin to allow hepatic recycling of heme iron. .