Portraits as Topic: Graphic representations, especially of the face, of real persons, usually posed, living or dead. (From Thesaurus for Graphic Materials II, p540, 1995)PortraitsMedicine in ArtPaintingsArtFamous PersonsHistory, 15th Century: Time period from 1401 through 1500 of the common era.History, 16th Century: Time period from 1501 through 1600 of the common era.History, 17th Century: Time period from 1601 through 1700 of the common era.Nobel PrizeHistory, Medieval: The period of history from the year 500 through 1450 of the common era.History, 20th Century: Time period from 1901 through 2000 of the common era.History, 19th Century: Time period from 1801 through 1900 of the common era.Gene Expression Profiling: The determination of the pattern of genes expressed at the level of GENETIC TRANSCRIPTION, under specific circumstances or in a specific cell.Face: The anterior portion of the head that includes the skin, muscles, and structures of the forehead, eyes, nose, mouth, cheeks, and jaw.Oligonucleotide Array Sequence Analysis: Hybridization of a nucleic acid sample to a very large set of OLIGONUCLEOTIDE PROBES, which have been attached individually in columns and rows to a solid support, to determine a BASE SEQUENCE, or to detect variations in a gene sequence, GENE EXPRESSION, or for GENE MAPPING.Cluster Analysis: A set of statistical methods used to group variables or observations into strongly inter-related subgroups. In epidemiology, it may be used to analyze a closely grouped series of events or cases of disease or other health-related phenomenon with well-defined distribution patterns in relation to time or place or both.Phylogeny: The relationships of groups of organisms as reflected by their genetic makeup.