| IDENTIFICATION OF SPECIES OF ORIGIN | 
	Species of Origin Confirmed by Nucleoside Phosphorylase, Glucose-6-Phosphate Dehydrogenase, and Lactate Dehydrogenase Isoenzyme Electrophoresis and by Chromosome Analysis | 
	|   | 
                                                                
	| Gene | 
	APOE | 
	| Chromosomal Location | 
	19q13.2 | 
	| Allelic Variant 1 | 
	107741.0015; APOE3 ISOFORM | 
	| Identified Mutation | 
	CYS112 AND ARG158; Weisgraber et al. [J. Biol. Chem. 256: 9077-9083 (1981)] and Rall et al. [Proc. Nat. Acad. Sci. 79: 4696-4700 (1982)] identified one of the 3 major apolipoprotein E isoforms, apolipoprotein E3. The variant has Cys112 and Arg158. This is the most common variant, with frequencies of 40% to 90% in various populations. | 
	|   | 
	| Gene | 
	APOE | 
	| Chromosomal Location | 
	19q13.2 | 
	| Allelic Variant 2 | 
	107741.0015; APOE3 ISOFORM | 
	| Identified Mutation | 
	CYS112 AND ARG158; Weisgraber et al. [J. Biol. Chem. 256: 9077-9083 (1981)] and Rall et al. [Proc. Nat. Acad. Sci. 79: 4696-4700 (1982)] identified one of the 3 major apolipoprotein E isoforms, apolipoprotein E3. The variant has Cys112 and Arg158. This is the most common variant, with frequencies of 40% to 90% in various populations. |