The S1 portion is the initial portion of the proximal convoluted tubule and is responsible for avid reabsorption of water and solutes[GO]. [ http://amigo.geneontology.org/amigo/term/GO:0072031 http://sourceforge.net/tracker/?func=detail&atid=440764&aid=3298740&group_id=36855 ]

Synonyms: S1 portion of tubule S1 portion of renal tubule proximal tubule segment 1 segment 1 of proximal tubule

This is just here as a test because I lose it