The present invention relates to the use of trefoil factor 1 and trefoil factor 3 dimers and a pharmaceutical composition comprising TFF dimers for increasing the viscosity of mucin in mucus layers and the repair of damaged mucus layers in the gastrointestinal tract the respiratory passages, the eye, the urinary system and the cervis uteri. A source of light is removeably and unmovingly attached to a conduit of the rail conditioning system to direct a beam of light toward a rail to verify a location of impingement of a spray of rail conditioning material. The message comprises a logical partition header and a network segmentation header. The vapors are condensed and separated by conventional techniques. The detector is located on a tertiary mirror reflecting light path. One or more inflatable members or an inflatable ring are used to cushion the tissue from the rigid retractor blades.