Anabolic steroids are synthetic substances related to male sex hormones (androgens). Although it is illegal in the United States to possess or distribute anabolic steroids for nonmedical use, a "black market" for them exists, and many amateur and professional athletes take them to enhance performance. In many cases, the athletes take doses that are extremely high—perhaps 100 times the doses that might be prescribed for medical use. As a result, they put themselves in real danger of short-term and long-term health problems. Blood testing, as has been used in the Olympic Games, can detect, identify, and quantify the presence of anabolic steroids in the blood of athletes, which can lead to the disqualification of an athlete.
SRAP signal, which disappeared when the antibody was preincubated with the corresponding peptide, was observed in some (24 tumors, ., lanes 1, 2, 8), but not all (50 tumors, ., lanes 3, 4, 5, 7), tumors (Fig. 1 a,b ). As expected, the size of the bands varied around 30 kDa, likely as a result of the genetic background (homozygous/heterozygous for the different alleles) of the patients. 14 A band of approximately 25 kDa, not previously seen in breast cancer cell lines, 14 was also specifically recognized in 34 cases ( ., lanes 1, 2, 4–8 of Fig. 1 a ).