Figure 1From: Antibody response to a sterile filtered PPD tuberculin in M. bovis infected and M. bovis sensitized cattleTwelve percent SDS-PAGE analysis of HK PPD and SF-PPD. (a) Gel stained with non-fixing silver stain. Lanes: 1, Sample buffer; 50 μL. 2. molecular weight standards (Silver Stain SDS-PAGE Standards Low Range, BIO-RAD). 3, SF-PPD; 12.5 μg. 4, HK-PPD; 12.5 ug.Back to article page