This definition appears rarely
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Samples in periodicals archive:
Histochemical Journal 28, 709-714 (1996) The use of enhanced polymer one-step staining reagents for immunoenzyme double-labelling
A rapid enhanced polymer one-step staining for proliferating cell nuclear antigen [EPOS-PCNA) in formalin fixed, paraffin embedded sections of tongue squamous cell...
Rott T, Velkavrh D. Our experience with the enhanced polymer one-step staining in frozen sections. Acta Otolaryngol (Stockh) 1997; Suppl 527: 114-115.
Tsutsumi Y, Serizawa A, Kawai K. Enhanced polymer one-step staining (EPOS) for proliferating cell nuclear antigen (PCNA) and Ki-67 antigen...