Chitin is also found in the cell walls of certain fungi and algae. Biology chitin definition of by the free dictionarycollins english dictionary. It is a primary component of cell walls in fungi, the exoskeletons chitine, which was derived 1821 from greek word (chiton), meaning covering although you may have never heard it, chitin abundant nature.
Amyotrophic lateral sclerosis (ALS) is a progressive neurological disease that causes muscle weakness and gradually impacts on the functioning of the body, leading to eventual death. It is also referred to as motor neuron disease or Lou Gehrig's disease, named after the famous baseball player who had the condition.
1 Most of the time ALS is not inherited. 2  In about 90% of cases, the person is the only member of the family with the disease. 3  These cases are called âsporadic ALSâ. 4  The cause of sporadic ALS is not well understood, but may be due to a combination of environmental and genetic risk factors. These cases are called âsporadic ALSâ. 2  The cause of sporadic ALS is not well understood, but may be due to a combination of environmental and genetic risk factors. 3  About 10% of cases are considered âfamilial ALSâ (FALS).