Figure 2: Staining for HE, PSA, PSAP, and mucin at 400× magnification. (a) Representative HE staining for primary SRCC of the prostate. Representative immunohistochemical staining for (b) PSA and (c) PSAP in tumor cells. Representative mucin staining of (d) PAS, (e) mucicarmine, and (f) Alcian blue for primary SRCC of the prostate. HE: hematoxylin and eosin; PSA: prostate-specific antigen; PSAP: prostatic-specific acid phosphatase; SRCC: signet ring cell carcinoma; PAS: periodic acid Schiff.