Abstract: A continuous flow analysis system measures the cholesterol distribution among different lipoprotein classes in a blood sample. A blood plasma sample is separated into different lipoprotein classes by single vertical spin density gradient ultracentrifugation. The sample is then introduced in a continuous succession into a continuous reagent stream which flows through a detector. A signal of the reaction, such as the absorbance of the reaction product, is continuously monitored as the reaction mixture flows through the detector. The detector measures a transient signal thus allowing a relatively short reaction period. The absorbance data is digitized and analyzed with the help of a computer to generate a cholesterol profile indicative of the cholesterol concentration in each lipoprotein class.

Abstract: The present invention relates to peptides of the formulaA.sub.1 -B.sub.1 -B.sub.2 -C.sub.1 -D-B.sub.3 -B.sub.4 -A.sub.2 -C.sub.2 -B.sub.5 -B.sub.6 -A.sub.3 -C.sub.3 -B.sub.7 -C.sub.4 -A.sub.4 -B.sub.8 -B.sub.9wherein:A.sub.1, A.sub.2, A.sub.3 and A.sub.4 are independently aspartic acid or glutamic acid, or homologues or analogues thereof;B.sub.1, B.sub.2, B.sub.3, B.sub.4, B.sub.5, B.sub.6, B.sub.7, B.sub.8 and B.sub.9 are independently tryptophan, phenylalanine, leucine, alanine, tyrosine, isoleucine, valine or .alpha.-naphtylalanine, or homologues or analogues thereof; C.sub.1, C.sub.2, C.sub.3, and C.sub.4 are independently lysine or arginine, or homologues or analogues thereof, and D is serine, threonine, alanine, glycine, or histidine; provided that, when A.sub.1 and A.sub.2 are aspartic acid, A.sub.3 and A.sub.4 are glutamic acid, B.sub.2 and B.sub.7 are leucine, B.sub.3 and B.sub.9 are phenylalanine, B.sub.4 is tyrosine, B.sub.5 is valine, and C.sub.1, C.sub.2, C.sub.3 and C.sub.4 are lysine, and B.