diff --git a/scibot/extract.py b/scibot/extract.py
index d380bde..2198fca 100644
--- a/scibot/extract.py
+++ b/scibot/extract.py
@@ -340,6 +340,12 @@ def find_rrids(text):
     for prefix, a, b, nums, suffix in matches4:
         yield prefix, f'RRID:SAMN{nums.strip()}', f'{a}{b}{nums}', suffix
 
+    # fifth round for NCBI Taxonomy
+    regex5 = r'(.{0,32})(NCBI)(:?\s?)(taxid|Taxid|taxId|TaxId|taxID|TaxID|txid|txId|txID|Txid|TxId|TxID|Taxon|Taxonomy)(_|:)(\s?)([0-9]{3,8})([^\w].{0,31})'
+    matches5 = re.findall(regex5, text)
+    for prefix, ncbi, delim1, tax, delim2, delim3, nums, suffix in matches5:
+        yield prefix, f'RRID:NCBITaxon_{nums.strip()}', f'{ncbi}{tax}{nums}', suffix
+
 
 # extract from post