Human low density lipoprotein receptor (LDLR), also known as FH, FHC, and LDLCQ2, GenBank Accession No. NM_000527, a.a. 22-788(end), with C-terminal FLAG and Avi tags, MW=87.7 kDa, expressed in an HEK293 cell expression system and enzymatically biotinylated using Avitag™ technology.