P. Ehrlich, "On Immunity...," diagrams
Licence: In copyright
Credit: P. Ehrlich, "On Immunity...," diagrams. Wellcome Collection. Source: Wellcome Collection.
![no text alternative](https://iiif.wellcomecollection.org/image/L0033026/full/800%2C/0/default.jpg)
Licence: In copyright
Credit: P. Ehrlich, "On Immunity...," diagrams. Wellcome Collection. Source: Wellcome Collection.