Linkage efficiency of databases within SRS. The percentage of records in a specific database (in rows) linked to others (columns) are shown. Numbers in brackets are the total number of fields in the particular database. The NKB/NKI Coupling , BC_NATURE_tVeer , Incyte Human UNIGEM V 1.0, PC_NATURE_Dhana. , Sigma/Compugen oligo array , and PC_PNAS_Lapointe , are linked to UniGene via a single accession code connection (see Figure 2). Direct links are depicted as grey cells. The Affymetrix U133A and U95 coupling files  are directly linked to different biological databases.