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:

A dipeptide and an amino acid present in whey protein hydrolysate increase translocation of GLUT-4 to the plasma membrane in Wistar rats. Whey protein hydrolysate (WPH) is capable of increasing muscle glycogen reserves and of concentrating the glucose transporter in the plasma membrane (PM). The objective of this study was to determine which WPH components could modulate translocation of the glucose transporter GLUT-4 to the PM of animal skeletal muscle. Forty-nine animals were divided into 7 groups (n=7) and received by oral gavage 30% glucose plus 0.55g/kg body mass of the following WPH components: (a) control; (b) WPH; (c) l-isoleucine; (d) l-leucine; (e) l-leucine plus l-isoleucine; (f) l-isoleucyl-l-leucine dipeptide; (g) l-leucyl-l-isoleucine dipeptide. After receiving these solutions, the animals were sacrificed and the GLUT-4 analysed by western blot. Additionally, glycogen, glycaemia, insulin and free amino acids were also determined by standard methods. Of the WPH components tested, the amino acid l-isoleucine and the peptide l-leucyl-l-isoleucine showed greater efficiency in translocating GLUT-4 to the PM and of increasing glucose capture by skeletal muscle.
{"Chemical": ["l-isoleucyl-l-leucine dipeptide", "glucose", "amino acids", "amino acid", "l-isoleucine", "dipeptide", "l-leucyl-l-isoleucine dipeptide", "l-leucyl-l-isoleucine", "l-leucine"]}