You will be shown an abstract from a biomedical research paper. Given this abstract, your task is to extract all unique entities of the following types: ["Chemical"].

Please return the output as a JSON object of the format: {"Chemical": ["Arsenic", ...]}. The keys should be entity types and values should be lists of extracted entities belonging to the corresponding type. If you cannot find entities belonging to a specific type, the value should be [].

Only output the JSON object and do not include any additional text.

Abstract:

Transfer of lipids to high-density lipoprotein (HDL) is altered in patients with familial hypercholesterolemia. OBJECTIVE: In familial hypercholesterolemia (FH), the metabolism and anti-atherogenic functions of HDL can be affected by the continuous interactions with excess LDL amounts. Here, lipid transfers to HDL, an important step for HDL intravascular metabolism and for HDL role in reverse cholesterol transport (RCT) were investigated in FH patients. METHODS: Seventy-one FH patients (39±15years, LDL-cholesterol=274±101; HDL-cholesterol=50±14mg/dl) and 66 normolipidemic subjects (NL) (38±11years, LDL-cholesterol=105±27; HDL-cholesterol=52±12mg/dl) were studied. In vitro, lipid transfers were evaluated by incubation of plasma samples (37°C, 1h) with a donor lipid nanoemulsion labeled with 3H-triglycerides (TG) and 14C-unesterified cholesterol (UC) or with 3H-cholesteryl ester (EC) and 14C-phospholipids (PL). Radioactivity was counted at the HDL fraction after chemical precipitation of apolipoprotein (apo) B-containing lipoproteins and the nanoemulsion. Data are % of total radioactivity measured in the HDL fraction. RESULTS: Transfer of UC to HDL was lower in FH than in NL (5.6±2.1 vs 6.7±2.0%, p=0.0005) whereas TG (5.5±3.1 vs 3.7±0.9%, p=0.018) and PL (20.9±4.6 vs 18.2±3.7 %, p=0.023) transfers were higher in FH. EC transfer was equal. By multivariate analysis, transfers of all four lipids correlated with HDL-cholesterol and with apo A-I. CONCLUSION: FH elicited marked changes in three of the four tested lipid transfers to HDL. The entry of UC into HDL for subsequent esterification is an important driving force for RCT and reduction of UC transfer to HDL was previously associated to precocious coronary heart disease. Therefore, in FH, HDL functions can be lessened, which can also contribute to atherogenesis.
{"Chemical": ["14C", "cholesterol", "3H-triglycerides", "3H-cholesteryl ester"]}