MNS1 and fibrosarcoma: Zabielska-Koczywąs et al. [11] identified three significantly (p ≤ 0.05) differentially expressed proteins (annexin A5 (ANXA5), annexin A3 (ANXA3), and meiosis-specific nuclear structural protein 1 (MNS1)) in doxorubicin-resistant fibrosarcomas compared to doxorubicin-sensitive ones, and claimed that they may be involved in the chemotherapy resistance of feline fibrosarcomas.