Distinct molecules called agglutinogens (a type of antigen) are attached to the surface of red blood cells. There are two different types of agglutinogens, type A and type B. Each type has different properties.
MDB: Geodatabase. The geodatabase is a collection of geographic datasets of various types, with the most basic types being vector, raster, and tabular data. There are three types of geodatabases: file, personal, and ArcSDE. Geodatabases are the native data format for ESRI's ArcGIS.
A spatial reference that ArcGIS Explorer can make use of includes settings for: 1  The coordinate system. 2  The coordinate precision with which coordinates are stored (often referred to as the coordinate resolution) 3  Processing tolerances (such as the cluster tolerance)