For instance, intron 2 of BRCA1 DNA repair associated (BRCA1) and intron 2 of its pseudogene PsiBRCA1 can be exchanged by recombination, transferring BRCA1 into a “nonfunctional” gene without a tumor suppressive effect 59, which constitutes a new mechanism for inactivating antitumor genes. Here, BRCA1 is linked to neoplasm.