SPANXA1 and cancer: On the other hand, we describes for the first time novel SPANX-A/D phosphorylated residues in normal human spermatozoa in vivo, in spite of some phosphosites have been previously reported in different cancer cell types (PhosphoSitePlus database 11076738, 11076741, 9161501, 50832232, 11076732, and 11076735).