Question: which cell type starts with the letter r
Paraphrase: which cell sort begins with the letter r
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q189118 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 'r')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
Answer: retinal ganglion cell, retinal ganglion cell, rod cell, rod cell, retina amacrine cell, retina amacrine cell, retina bipolar cells, retina bipolar cells, red blood cell, red blood cell, retinal microglial cell, retinal microglial cell, radial astrocyte, radial astrocyte, retinal glial cell, retinal glial cell, radial retinal glial cell, radial retinal glial cell, retinal pigment cell, retinal pigment cell, reticular cell, reticular cell, Renshaw cell, Renshaw cell, regulatory T cell, regulatory T cell, retina horizontal cell, retina horizontal cell, Reed–Sternberg cell, Reed–Sternberg cell, Rieder's cells, Rieder's cells, reticulocyte, reticulocyte, Retinal precursor cells, Retinal precursor cells, rabbit hybridoma, rabbit hybridoma, reproductive cells, reproductive cells, Rohon-Beard cell, Rohon-Beard cell, retinal cell, retinal cell, regulatory B cell, regulatory B cell, receptor cell, receptor cell, ragocyte, ragocyte