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Age‐related deposition of amyloid P component in normal human testis

The distribution of amyloid P component in normal human testes from fetal life to old age was studied by a direct immunofluorescent technique on frozen sections. Amyloid P is readily and invariably detected in association with elastic fibres around seminiferous tubules and in blood vessels from the age of 30 years upwards. The same is true for most cases during the twenties, but in no case below the age of 18 was its presence demonstrable.