SDS-PAGE of Guanidinium chloride extract of the Achilles tendon. Analysis in SDS-PAGE showed faint bands of collagen and other proteins in control trained animals (CT). Note that H. aphrodisiaca treatment (HS) maintained the same bands displayed in control sedentary animals (CS) and also exhibited other NCP bands. In treated and exercised animals (HT) the appearance of NCP was accentuated. LMW- Low molecular weight standard.