Table 1. Echidna transcripts that display higher similarity to known toxins than human proteins.
| Toxin name | Transcript locus number | Expression rank (out of 91,300) |
| Stonustoxin subunit alpha (Acc: Q98989) | 726, 11716 | 24,455 |
| Platypus CD55/complement decay accelerating factor (Acc: K4PB89) | 2792, 50224 | 42,570 |
| Platypus amide oxidase (Acc: K4P911) | 8792, 18049 | 71,866 |
| Snake venom nerve growth factor 2 (Tropidechis carinatus) (Acc: Q3HXX7) | 11196 | 36,479 |
| Snake venom nerve growth factor (Naja naja)(Acc: P01140) | 11197 | 20,498 |
| Platypus corticotrophin-releasing factor binding protein (Acc: K4PLU9) | 11716 | 79,938 |
| Platypus Kunitz domain containing protease inhibitor | 16527 | 61,251 |
| Sea anemone Kunitz domain containing protease inhibitor (Acc: Q9TWG0) | 16966 | 41,527 |
| Snake mulgin-3 protease inhibitor (Pseudechis australis) (Acc: Q6ITB9) | 16966, 47678 | 35,771 |
| Platypus cysteine-rich secretory protein (Acc: K4P991) | 40579 | 51,113 |
| Snake venom phospholipase A2 (Echis carinatus)(Acc: P48650) | 43122 | 53,680 |
| Snake venom phospholipase A2 trimucrotoxin (Protobothrops mucrosquamatus ) (Acc: Q90W39) | 49881 | 83,368 |
The name of the known toxin together with the echidna transcript number and ranking of mRNA expression level are shown (a higher ranking indicates higher expression levels relative to other transcripts in the echidna transcriptome).