three , b2 , c23 , and 2a1 , were found to discriminate basal cell carcinomas ( bccs ) from benign proliferative disorders of skin , and 2a1 , a monoclonal antibody against the heavy chain component of class 1 human leukocyte antigens ( hla ) for the first time directly demonstrated the absence of this structure from the malignant cell membrane .
C0007117
basal cell carcinomas
C0334227
malignant cell