Protist Ribosomal Reference Database

The PR2 reference sequence database began as part of the BioMarks project from previous work in the Plankton Group of the Station Biologique of Roscoff. It aims to provide a reference database of carefully annotated 18S rRNA sequences using nine unique taxonomic fields (from domain to species). At present, it contains over 240,000 sequences. Although it focuses on protists, it also contains sequences from metazoa, fungi and plants as well a limited set of 16S sequences from plastids and bacteria. Several metadata fields are available for many sequences, including geo-localisation, whether it originates from a culture or a natural sample, and host type. The annotation of PR2 is performed by experts in each of the taxonomic groups.PR2参考序列数据库起源于罗斯科夫生物站浮游生物组既往研究中的BioMarks项目。该数据库旨在打造一套经严谨注释的18S核糖体RNA（18S rRNA）序列参考库，采用从域到种的9个专属分类学字段完成分类标注。目前，该数据库已收录超过24万条序列。尽管其核心收录范畴为原生生物，但同时也涵盖后生动物、真菌与植物的相关序列，以及少量来自质体和细菌的16S序列。多数序列附带多项元数据字段，包括地理定位信息、序列来源（培养物或自然样本）以及宿主类型等。PR2的序列注释工作由各分类类群的专家完成。

搜集汇总

背景与挑战

背景概述

PR2（Protist Ribosomal Reference）参考序列数据库是一个专注于原生生物的18S rRNA序列资源，提供超过22万条使用九个分类字段精心注释的序列。它起源于BioMarks项目，并包含来自后生动物、真菌和植物等类群的序列，同时为许多序列提供地理定位和来源等元数据。数据库的注释工作由各分类群的专家完成。