histogen. n. 1. (Botany) (formerly) any of three layers in an apical meristem that were thought to give rise to the different parts of the plant: the apical meristem is now regarded as comprising two layers. See corpus, tunica.a Regenerative Medicine company) and is on the Surgical Faculty for the Procedural Dermatology Fellowship at the University of California at Irvine, Dermatology Faculty, Western University/Pacific Hospital, Long Beach, California and Michigan State University, Dermatology Faculty.
People with fluid in the lungs will experience the following signs and symptoms. 1  Fatigue. 2  Breathing difficulties. 3  Weakness. Cough. 4  Grunting. Pale 5  skin. Restlessness.  Excessive sweating.
Depending on how much fluid has accumulated in the lungs, the clinical signs of pulmonary edema can be very mild or severe and may include: 1  Coughing. 2  Difficulty breathing or rapid breathing. 3  Weakness and collapse. 4  Blue lips and tongue (a condition known as cyanosis, which occurs when the body lacks adequate oxygen)