::: I am sure this needs more than a references to Schwann's defintion. --[[User:Joaquín Martínez]], [[User talk:Joaquín Martínez|talk]] 08:50, 28 March 2008 (EDT) | ::: I am sure this needs more than a references to Schwann's defintion. --[[User:Joaquín Martínez]], [[User talk:Joaquín Martínez|talk]] 08:50, 28 March 2008 (EDT) |