Term Name:	proximal convoluted tubule segment 1
Synonyms:	proximal tubule segment 1, S1, S1 portion of renal tubule, S1 portion of tubule, segment 1 of proximal tubule
Definition:	The S1 portion is the initial portion of the proximal convoluted tubule and is responsible for avid reabsorption of water and solutes[GO].
Ontology:	Uberon Ontology [UBERON:0004196]