TXNDC2 and oligospermia: mei (meiotic arrest); norm_oa (normal spermatogenesis or obstructive azoospermia); oligo (oligospermia); post (post meiotic arrest); pre (pre meiotic arrest); SCOS (Sertoli cell-only syndrome); unknown (azoospermia with unknown pathology); TXNDC2 (Thioredoxin Domain Containing 2); TXNDC8 (Thioredoxin Domain Containing 8); PRM1 (Protamine 1); PRM2 (Protamine 2); TNP1 (Transition Protein 1).