  Calculations of high-energy processes involving the production of b-quarks
are typically performed in two different ways, the massive four-flavour scheme
(4FS) and the massless five-flavour scheme (5FS). For processes where the
combination of the 4FS and 5FS results into a matched calculation is
technically difficult, it is possible to define a hybrid scheme known as the
doped scheme, where above the b-quark threshold the strong coupling runs with
$n_f=5$, as in the massless calculation, while the DGLAP splitting functions
are those of the $n_f=4$ scheme. In this contribution we present NNPDF3.0 PDF
sets in this doped scheme, compare them with the corresponding 4FS and 5FS
sets, and discuss their relevance for LHC phenomenology.
