25.6.2003 Assay factored out from the marker table. Marker is now mere identifier without version number (ms explorer users please stretch the image to full size).
28.2.2003 The DDL is separated into three differen parts. Genotype core, subject (subjec and famly, twin stuff) and annotations (generic tables needed to annotate objects).
6.3.2003 Working set modified (Is-A dbxeref) Code cleaning done and constraints added..
