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.
An ArcPad Graphics layer (filename.APG) is a vector file format written in XML. The XML tags used by the ArcPad Graphics layer are described in the ArcPad Studio Help. The ArcPad Data Manager for ArcGIS Desktop includes tools for exporting ArcGIS graphic elements to ArcPad graphics layers, and vice versa.