An example of "irregular" intermittent (irregularly irregular) pulse is atrial fibrillation. Collenchyma tissue is composed of elongated cells with irregularly thickened walls. It begins as painless reddish-brown nodules which slowly enlarge to form irregularly shaped red plaque. The colouration is yellowish-brown with several irregularly distributed dark spots on the rear half. The adrenal medulla consists of irregularly shaped cells grouped around blood vessels. Cultured colonies are usually large, spreading, and irregularly shaped. Slub Effect means a yarn with thick and thin sections alternating regularly or irregularly. The pits are rounded and irregularly arranged. These shanty towns had narrow walkways between irregularly shaped lots and dwellings. The leaves are about long, smooth, toothed, soft, and irregularly undulated. Sickle cell anemia may cause brain ischemia associated with the irregularly shaped blood cells. The irregularly distributed asci contain eight unicellular ascospores each. Fruit is an aggregate of nuts, a berry, or an irregularly dehiscent fleshy spongy capsule. Mars has two moons, Phobos and Deimos, which are small and irregularly shaped. These fifes were one piece, cylindrical bore instruments with six irregularly sized and placed tone-holes.