Versions of 26 CFR 1.28-0 - Credit for clinical testing expenses for certain drugs for rare diseases or conditions; table of contents on LawServer 2024 26 CFR 1.28-0 – Credit for clinical testing expenses for certain drugs for rare diseases or conditions; table of contents 2023 26 CFR 1.28-0 – Credit for clinical testing expenses for certain drugs for rare diseases or conditions; table of contents 2022 26 CFR 1.28-0 – Credit for clinical testing expenses for certain drugs for rare diseases or conditions; table of contents 2021 26 CFR 1.28-0 – Credit for clinical testing expenses for certain drugs for rare diseases or conditions; table of contents 2020 26 CFR 1.28-0 – Credit for clinical testing expenses for certain drugs for rare diseases or conditions; table of contents 2019 26 CFR 1.28-0 – Credit for clinical testing expenses for certain drugs for rare diseases or conditions; table of contents 2016 26 CFR 1.28-0 – Credit for clinical testing expenses for certain drugs for rare diseases or conditions; table of contents 2015 26 CFR 1.28-0 – Credit for clinical testing expenses for certain drugs for rare diseases or conditions; table of contents 2014 26 CFR 1.28-0 – Credit for clinical testing expenses for certain drugs for rare diseases or conditions; table of contents 2010 26 CFR 1.28-0 – Credit for clinical testing expenses for certain drugs for rare diseases or conditions; table of contents 2009 26 CFR 1.28-0 – Credit for clinical testing expenses for certain drugs for rare diseases or conditions; table of contents.