diff --git a/test_files/twin_heli_fam157b_55.fa b/test_files/twin_heli_fam157b_55.fa
new file mode 100644
index 0000000..f4189e6
--- /dev/null
+++ b/test_files/twin_heli_fam157b_55.fa
@@ -0,0 +1,8 @@
+>PrimatesAnc003_Anc003refChr23290_1519_2861
+TGGCCTCCCAAAGTATTGGTATTACAGGCATGAGCCATTGTGCCCACCCTCTCTGGTTCTTAACCTTCTGCCTCCCTCTTCCACATTTAAAGAACCCTTGTAATTAC-ATGGGCTCACCCAGATACTCCAGGATAATCTTGTTTTAAGGTCAGCTGATTAGCAACATTAATTCCATCTGCACTCTTAT-ATCCCCCTTCCTA
+TGTAATTGTGCTGTGTAACAT
+AGGACATGAGCAATTTGTG----------GGGGGGTCATTACTCTGGTCACCACAGTGACTATTTTGTGCCAGGTACTGAGCTAAGCACTGGTGAATTAAGCATGAATAACACACACTCCCTAATCTCCATTCATTCATGGGAGGAGCACCTCACTTCCCATGCTCCTGAGAATCTGGGGAGTCAAGGAAGGCTTCCAGGAGGAGGTGATG
+>PrimatesAnc001_Anc001refChr30186_23_895
+------------------------------------------TGCCATCTCTCTGGTTCTGACCCTTCTGCCTCCCTCTTCCACATTTAAAGGACCCTTGTAATTACATG-GGCCCACCCAGATACTCCAGGATAATCTTGTTTTAAGGTCAGCTGATTAGCAACCTTAATTCCATCTGCACCCTTAATTCCCCCTTCCCAT
+GTAAAATAGCATAATTACACGGGGA
+-TTAGGA---CATGAACAACTTGTGGGGGAGACATTATTCTGCTTACCACAGTGACTATTTTGTGCCAGGTACTGAGCTAAGCACTGGGGAATTAAGCATGAATAACACATGCTCCCTAATCTCCATTCATTCATGGGAGGAGCACCTCACTTCCCATGCTCCTGAGAATTTGGGGAGTCAAGGAAGGCTTCCAGGAGGAGGTGATG
\ No newline at end of file
diff --git a/test_files/twin_heli_fam66b_37.fa b/test_files/twin_heli_fam66b_37.fa
new file mode 100644
index 0000000..1362a5c
--- /dev/null
+++ b/test_files/twin_heli_fam66b_37.fa
@@ -0,0 +1,4 @@
+>Homo_sapiens
+ATGAGACTTGTTTATCAGAGGTGGTCTTTCAGTGGAAAAGATTTTGAAGAATGGCCCCTTCCTTTTGTGTATTTGACGATTAGATTTCATGCCAAATCTCGGGTTTTAAACTCTATTTAAACGTTAACAGAATTAATTAAAATGGCGAAAAACCAAGAGATTCTTTGATTTGGAA-------------TCATCACATATTCATTTCTTG--TTAGGTACAGTTATCAAAGATGACCTACCGGAGAGAAACAATTGTGGAGAATGGCCCCTTACTTTTGTATATTTGCTGATTAGATTTCATAGTCCATTTCTCATTAGGTACAGAGATCAAAGTTGACCTACCCAAGAGTAGAGATGTCCAGGACAGAACTCAGGGCTCCGTAGAACCACAGAATCTTGGGTGCAACATTGCTCAAGAACAAAAATGTGCTTATTCAGAGTGTTTCTGTGT
+>PrimatesAnc069
+ATGTCAGTCATTTGGAACTAAGTCCTATTGATAATAAAGGAAATCAAAC-------ACAGGAGTGTGTGTATT--CAACTGAAATAAATTCAGAAAGCCCT-GAAAAAAAATCTCATTTGGTGTGCTTACAAA--TGGCATTTGGGGAGATTCCGGGTCATTCGTCCAGCTGCGAAAGCTACACCTCTGAAGCACAGTCCCTGTCCTTCAATCAGACTTACGTATCCG-ACGTGGTGTTTCCGTGGAAATGATTGTGGGAAATGGCCCCTTCCTTGTCTGTATTTGCTGATTAGATTTCATGGTCCCTTTCTCGTTAGGTGCAGTGATCAAAGTTGACCAACCCCAGAGGAAAGCTGCCCAGGGCACCACTCAGGGCTCCGTAGAACCACAGAATCTTGGGCGCAACCCTGCTCAAGCACCCAAATGTGCATACGAACAGGGTCTCCGTGT
\ No newline at end of file