This is just a quick fun pseudo colored electron micrograph disection of a corner of a type II alveolar cell (pneumocyte) from an aged guinea pig which was part of an inhalation study many many years ago (circa 1980s). These orderly contents of the rough endoplasmic reticulum have fascinated me for that many years and I have yet to see a good explanation for what they might be. I have seen similar inclusions in type II cells in ferret, mongrel dog and even a few in monkey.