Abstract: The present invention relates to a purified, biocompatible mucus, which has the ability to form a gel. The mucus of the invention may be provided in a tissue model, with a cell population. The mucin or tissue model of the invention may be useful in an in vitro model of digestion, mucus permeation and/or epithelial transport.

Abstract: The exercise devices disclosed herein are configurable to allow a user to perform various exercises. The exercise device can include an adjustable bench assembly connected with a frame supporting a cable-pulley assembly providing a user interface with a resistance system. A user can interface with an actuation component to pull resistance cables against resistance from the resistance system. Various exercise accessories can be provided that are easily connected with and removed from the exercise device to allow a user to perform different exercises. Some examples of exercise accessories are used to configure the exercise device for squat, abdominal, leg extension, leg curl, and arm curl exercises. The frame can also be configured to selectively place the exercise device in a stationary operating configuration supported by the frame on a support surface and a storage configuration wherein the exercise device is rollingly supported on the support surface by wheels.