(A) Detection of miR‐371a‐3p in testis in relation to Johnsen score. Left Y‐axis 40‐Ct, scale log2, right y‐axis Johnsen score (Spearman's rho correlation coefficient (0.871, p = 0.000). (B) Detection of miR‐371a‐3p in epididymis in relation to Johnson score. Left Y‐axis 40‐Ct, scale log2, right y‐axis Johnsen score. (C) Detection of miR‐371a‐3p in semen. The measurements in the 14 semen samples normalized with miR‐20a‐5p (samples 1–3 have oligospermia with sperm concentrations below 12 million/ml; numbers 4–8 have a sperm concentration between 17 million/ml and 35 million/ml; and numbers 9–14 have a sperm concentration between 48 and 129 million/ml). Left Y‐axis 40‐Ct, scale log2, right y‐axis sperm concentration, linear scale. The miR‐371a‐3p level increased with the sperm concentration (Spearman's rho correlation coefficient 0.849, p = 0.000).