## Kraken2
Kraken 2 is the newest version of Kraken, a taxonomic classification system using exact k-mer matches to achieve high accuracy and fast classification speeds. This classifier matches each k-mer within a query sequence to the lowest common ancestor (LCA) of all genomes containing the given k-mer. The k-mer assignments inform the classification algorithm.

### Standard
- Contains:   Refeq archaea, bacteria, viral, plasmid, human, UniVec_Core
- Update date: 9/4/2024
- Directory on HPC: `/cluster/tufts/biocontainers/datasets/kraken2/k2_standard_20240904`

### MinusB
- Contains:   Refeq archaea, viral, plasmid, human, UniVec_Core
- Update date: 9/4/2024
- Directory on HPC: `/cluster/tufts/biocontainers/datasets/kraken2/k2_minusb_20240904`

### PlusPF
- Contains:   Standard plus Refeq protozoa & fungi
- Update date: 9/4/2024
- Directory on HPC: `/cluster/tufts/biocontainers/datasets/kraken2/k2_pluspf_20240904`

### PlusPFP
- Contains:   Standard plus Refeq protozoa, fungi & plant
- Update date: 9/4/2024
- Directory on HPC: `/cluster/tufts/biocontainers/datasets/kraken2/k2_pluspfp_20240904`

### core_nt Database
- Contains:   Very large collection, inclusive of GenBank, RefSeq, TPA and PDB
- Update date: 9/4/2024
- Directory on HPC: `/cluster/tufts/biocontainers/datasets/kraken2/k2_core_nt_20240904`