57 Our business is subject to economic, political, regulatory and other risks associated with international operations. Our business is subject to risks associated with conducting business internationally. Some of our suppliers and collaborative relationships are located outside the United States. Accordingly, our future results could be harmed by a variety of factors, including: • economic weakness, including inflation or political instability in particular non-U.S. economies and markets; • differing and changing regulatory requirements, pricing and reimbursement regimes in non-U.S. countries; • challenges enforcing our contractual and intellectual property rights, especially in those foreign countries that do not respect and protect intellectual property rights to the same extent as the United States; • difficulties in compliance with non-U.S. laws and regulations; • changes in non-U.S. regulations and customs, tariffs and trade barriers; • changes in non-U.S. currency exchange rates and currency controls; • changes in a specific country’s or region’s political or economic environment; • trade protection measures, import or export licensing requirements or other restrictive actions by U.S. or non-U.S. governments; • negative consequences from changes in tax laws; • compliance with tax, employment, immigration and labor laws for employees living or traveling abroad; • workforce uncertainty in countries where labor unrest is more common than in the United States; • difficulties associated with staffing and managing international operations, including differing labor relations; • potential liability under the FCPA or comparable foreign laws; and • business interruptions resulting from geo-political actions, including war (including the current Russia-Ukraine conflict) and terrorism or natural disasters. Following the result of a referendum in 2016, the United Kingdom, or UK, left the European Union, or EU, on January 31, 2020, commonly referred to as Brexit. Pursuant to the formal withdrawal arrangements agreed between the UK and the EU, the UK was subject to a transition period until December 31, 2020, or the Transition Period, during which EU rules continued to apply. A trade and cooperation agreement, or the Trade and Cooperation Agreement, that outlines the future trading relationship between the United Kingdom and the European Union applied provisionally from January 1, 2021, and formally entered into force on May 1, 2021. Since a significant proportion of the regulatory framework in the UK, is derived from EU directives and regulations, Brexit may have a material impact upon the regulatory regime applicable to our operations, including with respect to our ability to obtain regulatory approvals of our product candidates in the EU. For example, Great Britain is no longer covered by the centralized procedures for obtaining EU-wide marketing authorization from the European Medicines Agency, or EMA, and a separate marketing authorization will be required to market our product candidates in Great Britain. Any delay in obtaining, or an inability to obtain, any marketing approvals, would restrict our ability to generate revenue and achieve and sustain profitability. While the Trade and Cooperation Agreement provides for the tariff-free trade of medicinal products between the UK and the EU there are additional non-tariff costs to such trade which did not exist prior to the end of the Transition Period. Further, should the UK diverge from the EU from a regulatory perspective in relation to medicinal products, tariffs could be put into place in the future. We could therefore, both now and in the future, face significant additional expenses (when compared to the position prior to the end of the Transition Period) to operate our business, which could significantly and materially harm or delay our ability to generate revenues or achieve profitability of our business. Any further changes in international trade, tariff and import/export regulations as a result of Brexit or otherwise may impose unexpected duty costs or other non-tariff barriers on us. These developments, or the perception that any of them could occur, may significantly reduce global trade and, in particular, trade between the impacted nations and the UK It is also possible that Brexit may negatively affect our ability to attract and retain employees, particularly those from the EU.