Terminal structure of the protonephridia unit, capping the proximal tubules. Flame cells are defined by the filtration weir‚ or filtration diaphragm, which consists of closely apposed strands of cytoplasm surrounding a central cilia bundle, and by numerous microvilli between weir and cilia. Positive for acetyated tubulin. [ http://www.ncbi.nlm.nih.gov/pubmed/26057828 http://www.ncbi.nlm.nih.gov/pubmed/21828097 OCLC:16809160 ]

This is just here as a test because I lose it