Both reciprocal fusion transcripts can be detected: On the der(6) chromosome, the ETV6/STL mRNA shows an apparently out of frame fusion of ETV6 at nucleotide 187 to STL, which would result in the addition of 14 amino acids to the first 54 amino acids of ETV6.     ///    On the der(12) chromosome three different variants of the STL/ETV6 fusion mRNA could be detected. 