Chicken major histocompatibility complex(MHC) has been a research focus for its high polymorphism and close relation with varying resistance against diseases.It is located on a microchromosome(chromosome 16).It has been found that it has different resistance against diseases for different B haplotypes.The article gives a detailed introduction about structural characteristics,relation to diseases resistance,the progress in detection methods of chicken MHC,and the prospect of application of MHC in molecular b...