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Genestrip addresses this issue by focusing on small but freely configurable groups of organisms. Regarding the selected organisms, Genestrip produces\n                      <jats:italic>k<\/jats:italic>\n                      -mer databases and results comparable to those of KrakenUniq but at a fraction of its required memory resources. Our tool ensures that during database generation, the most suitable lowest common ancestor taxon is assigned for each stored\n                      <jats:italic>k<\/jats:italic>\n                      -mer by\n                      <jats:italic>also considering genomes of organisms whose<\/jats:italic>\n                      <jats:italic>k<\/jats:italic>\n                      <jats:italic>-mers are not included in the database<\/jats:italic>\n                      . This enables read analysis with high precision and recall for the organisms of interest.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>\n                      <jats:bold>Results<\/jats:bold>\n                    <\/jats:title>\n                    <jats:p>\n                      We assess the correctness, usefulness and performance of Genestrip in different contexts and show that it indeed ascertains high quality read classifications for organisms whose genomes are included in a corresponding database. Our example databases comprise millions to a few billions of\n                      <jats:italic>k<\/jats:italic>\n                      -mers covering a dozen to a few thousands of species and lend themselves to usage in tick surveillance, medical diagnostics or agriculture. All databases were generated on a regular PC within hours, and related analysis performance was competitive to highly favorable. The deliberate focus on a particular set of genera or species allows for more genomes to be included from related organisms while the resulting databases remain small. Since\n                      <jats:italic>k<\/jats:italic>\n                      -mer compression becomes unnecessary, false positives emerging from related information loss are entirely avoided. We exemplify that such small but deep databases tend to improve recall during read classification while sustaining high precision.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>\n                      <jats:bold>Conclusions<\/jats:bold>\n                    <\/jats:title>\n                    <jats:p>\n                      Due to Genestrip\u2019s particular way of updating the\n                      <jats:italic>k<\/jats:italic>\n                      -mers\u2019 lowest common ancestor taxa, both database creation and fastq file analysis can be realized with little memory and with favorable runtimes as well as high classification quality. So both, database creation\n                      <jats:italic>and<\/jats:italic>\n                      read classification may be performed even on regular PCs. Genestrip\u2019s qualities empower users to flexibly design, build and use small\n                      <jats:italic>k<\/jats:italic>\n                      -mer databases for their own needs with potentially deep genomic coverage.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s12859-026-06512-1","type":"journal-article","created":{"date-parts":[[2026,6,16]],"date-time":"2026-06-16T08:54:43Z","timestamp":1781600083000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Genestrip: exact and efficient read classification for selected groups of organisms"],"prefix":"10.1186","volume":"27","author":[{"given":"Daniel","family":"Pfeifer","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Markus","family":"Graf","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Clas","family":"Rurik","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,6,16]]},"reference":[{"issue":"3","key":"6512_CR1","doi-asserted-by":"publisher","first-page":"R46","DOI":"10.1186\/gb-2014-15-3-r46","volume":"15","author":"DE Wood","year":"2014","unstructured":"Wood DE, Salzberg SL. 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