Molecular Acquisition, Cleaning, and Evaluation in R 'MACER' R package MACER version 0.2.1 To assist biological researchers in assembling taxonomically and marker focused molecular sequence data sets. 'MACER' accepts a list of genera as a user input and uses NCBI-GenBank and BOLD as resources to download and assemble molecular sequence datasets. These datasets are then assembled by marker, aligned, trimmed, and cleaned. The use of this package allows the publication of specific parameters to ensure reproducibility. The 'MACER' package has four core functions and an example run through using all of these functions can be found in the associated repository <https://github.com/rgyoung6/MACER_example>. Software Imports: rentrez, ape, httr, stats, utils, ggplot2, parallel, pbapply, grDevices, png Robert G Young <rgyoung6@gmail.com> Comprehensive R Archive Network (CRAN) Robert G Young [aut, cre, cph] (ORCID: <https://orcid.org/0000-0002-6731-2506>), Rekkab Gill [aut], Daniel Gillis [aut], Robert H Hanner [aut, cph] GPL-2 GPL-3 2022-12-02 application/tgz https://CRAN.R-project.org/package=MACER doi:10.32614/CRAN.package.MACER en-GB