Notes on Information Available on this WWW Server                   
                                                                                
                                                                                
  1. Markers that appear on the maps as a number, eg. 508, are markers          
     that are not yet published.  Some information, eg. primer                  
     sequences, are restricted until publication.                               
                                                                                
  2. Marker types are defined as follows:                                       
                                                                                
          MS  microsatellite or simple sequence repeat                          
        RFLP  restriction fragment length polymorphism                          
       STARS  sequence tagged allelic restriction site                          
        SSCP  single strand conformation polymorphism                           
          EA  erythrocyte antigen                                               
        PROT  protein polymorphism                                              
                                                                                
  3. Microsatellites with alleles that did not amplify in some animals          
     are coded with a Y for null alleles.  Those that amplified in all          
     animals are left blank.                                                    
                                                                                
  4. Heterozygosity is the percentage of the parents in reference               
     populations that are heterozygous (have two different alleles)             
     for a given marker.  As of May 11, 1994, there were 10 reference           
     parents for pigs and 29 reference parents for cattle.  For the             
     most part, parents are unrelated with the exception that two sows          
     are fullsibs.  Plans have been developed to genotype samples of            
     unrelated animals from several different breeds of cattle and pigs.        
     When genotypic data is available from these breed panels,                  
     heterozygosity will be summarized by breed and breed cross.                
                                                                                
  5. Informative meioses is a measure of the amount of linkage                  
     information available to genetically map a given marker.                   
     Mathematically it is the number of genotyped progeny of                    
     heterozygous parents summed over all parents.