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 # Overview and Modularity
 PhyloToL Part 2 is designed to:
-1. Generate multisequence alignments (**MSAs**) firsts filtering in a "Pre-Guidance" step and then using [Guidance](https://taux.evolseq.net/guidance/source) version 2.02 , iterating to remove sequences considered non-homologs (based on sequence score is 0.3)
+1. Generate multisequence alignments (**MSAs**) after first filtering in a "Pre-Guidance" step and then using [Guidance](https://taux.evolseq.net/guidance/source) version 2.02 , iterating to remove sequences considered non-homologs (based on sequence score is 0.3)
 2. Generate gene trees using a 3rd party program (RaxML, IQTree, FastTree)
 3. Remove contaminating sequences with the "Contamination Loop" (**CL**) and user-defined rules for both sister/subsister and clade grabbing options
 4) Select orthologs and construct concatenated alignments for building species trees.