https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13999308Edit ImageSaveSaveEditCropCustom TextSir Henry Hallett Dale. Photograph.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseEditorial use only JPEGSmall JPEG 1200 x 849 px | 300 dpiLarge JPEG 3204 x 2268 px | 300 dpiFree DownloadSir Henry Hallett Dale. Photograph.More