text: Absence of antisperm antibodies in anejaculatory men.
  Antisperm antibodies were assessed in the serum samples of 73 men unable to ejaculate naturally and on the sperm cells of 13 of these men. None of the serum samples were found to be positive by sperm agglutination or sperm immobilization methods and antibodies were detected by an immunobead assay on the sperm cells of one of the 13 men examined.
  
entities.text: ['serum samples']
entities.type: Organism_substance
entities.entity_id: PMID-2211345_T1
entities.text: ['sperm cells']
entities.type: Cell
entities.entity_id: PMID-2211345_T2
entities.text: ['serum samples']
entities.type: Organism_substance
entities.entity_id: PMID-2211345_T3
entities.text: ['sperm']
entities.type: Cell
entities.entity_id: PMID-2211345_T4
entities.text: ['sperm']
entities.type: Cell
entities.entity_id: PMID-2211345_T5
entities.text: ['sperm cells']
entities.type: Cell
entities.entity_id: PMID-2211345_T6