That is the price for an antibody tag. The price of the actual Recombinant Human GDF‑11/BMP‑11 protein is 10x higher: ~$335 per 0.01 mg (this outfit charges $249 for 0.1 mg of the antibody).
Not sure what a dose would be… If a dose is less than 0.01 mg, then you have ~1-3 months (depending on how it is stored) to use it up. Still a bargain for those with the means…
