Pore-forming Toxin Pendant

Regular price €135.00 Save €-135.00
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Tax included. Shipping calculated at checkout.

It looks like a snowflake but it's actually a grinch, this custom design for Melanie Ohi's lab at Vanderbilt University represents the VacA pore-forming toxin of Helicobacter pylori, the culprit bacterium of ulcers and gastric cancer. Pore-forming toxins insert themselves into cell membranes in your gut and cause unregulated leakage of ions and small organic molecules across the membrane.

Pendant is 2.1 cm (0.83 inches) in diameter below the loop.

Due to restricted international freight service, I am offering premium express shipping of my jewelry to many countries. See the chart below for shipping prices and time estimates. As soon as I am again allowed to ship via Deutsche Post, I will offer reduced shipping rates.

 Jewelry Shipping

(please scroll down for T-shirt shipping information)

Jewelry in stock will be shipped within 1-2 days.

Jewelry not in stock is available for pre-order and will hopefully ship in 2-3 weeks. Delays may occur due to coronavirus-based shipping disruption.

Australia      DHL 5 Day 48.67 €
Austria UPS 2 Day 13.22 €
Belgium UPS 2 Day 11.75 €
Canada DHL 48 hr 37.17 €
France UPS 2 Day 13.22 €
Germany DHL 2 Day 5.49 €
Italy UPS 2 Day 13.04 €
Japan DHL 2 Day 45.57 €
Netherlands UPS 2 Day 11.75 €
Portugal UPS 4 Day 13.04 €
Spain DHL 24 hr 29.73 €
Sweden UPS 5 Day 13.22 €
Switzerland DHL 24 hr 29.73 €
United Kingdom UPS 3 Day 13.22 €
United States of America UPS 3 Day 32.70 €


You will be notified by mail when your order ships and given a tracking number so that you can follow your shipment. Ontogenie jewelry is shipped internationally from Germany via Deutsche Post and other carriers. Your jewelry will be gift-wrapped in original Ontogenie packaging.

In the unlikely event that your jewelry shipment is delayed by your local customs office, you are responsible for paying any fees incurred.

T-Shirt Shipping

Orders totaling more than 100 Euros ship free.

For orders less than 100 Euro, shipping cost added at checkout will be:

                                     Germany      5.49 Euro

                              Rest of World      7.20 Euro

Ontogenie T-shirts are printed in Charlotte, North Carolina, USA and Riga, Latvia in Europe. T-shirt printing requires 2-7 days fulfilment time. After fulfilment, your shipment should arrive in 3-10 business days.

In the unlikely event that your shirt shipment is delayed by your local customs office, Ontogenie is not liable for any fees incurred.

Express Shipping

Contact me at ontogenie3d@gmail.com for an express shipping quote. The cost of express shipping depends on your location and how soon you need your order.

tick silver earrings

Ontogenie jewelry is 3D printed in wax and then cast in solid sterling silver, solid brass and solid bronze as well as gold-plated brass. The silver and bronze pieces, and to a lesser extent brass, will tarnish and discolor slightly over time. This is completely normal for these materials. Since moisture tends to accelerate the tarnishing process, I recommend that you don't wear the jewelry in water, e.g., while bathing, showering or swimming. The oils in your skin will also contribute to tarnishing. I recommend polishing the jewelry with a soft cloth after wear and storage in a dark, dry place to slow the oxidation which causes tarnish.

If the jewelry should tarnish, I've found that it can be returned to its original brilliance and color by using a gentle, nonabrasive silver polish. The more detailed and highly textured pieces will be more difficult to polish because of surface variations. To polish these, I recommend using a very soft toothbrush with the silver polish to allow cleaning of small crevices. After polishing, you can remove excess polish by rinsing the jewelry in water and then washing the piece in with a gentle detergent followed by a final water rinse.

xenopus frog lapel pin bronze

The gold-plated materials, however, should not be vigorously polished as the plating is likely to wear off over time. The gold-plated materials are much less susceptible to tarnishing and will probably never need to be polished.

All of the jewelry should be protected from impact against hard surfaces as this could cause scratches. 

vacA pore-forming toxin microbiology pendant rose gold ontogenie science jewelry