HOXD13 and Bovine mastitis: Studies carried out by our research team showed that speC and spd1 genes are present in bovine SDSD from different geographic regions and years of isolation, namely SDSD from bovine mastitis isolated in Portugal in 2002–2003 and 2011–2013 (Rato et al., 2013; Alves-Barroco et al., 2021).