A total of 63 (4.72%) metabolites are not consumed by any reaction of the model: __iYS854__2hmcnsad_c, 2mb2coa_c, 2mp2coa_c, 2p4c2me_c, 4gudbutn_c, ...

Dead-ends are metabolites that can only be produced but not consumed by reactions in the model. They may indicate the presence of network and knowledge gaps. Implementation: Find dead-end metabolites structurally by considering only reaction equations and bounds. FBA is not carried out.

There are a total of 119 metabolites (8.91%) without a formula: __iYS854__12napdol_c, __iYS854__2mehbtpp_c, __iYS854__12diisgly_c, __iYS854__33hmeoxobut_c, __iYS854__3c1ht_c, ...

To be able to ensure that reactions are mass-balanced, all model metabolites ought to be provided with a chemical formula. Since it may be difficult to obtain formulas for certain metabolites this test serves as a mere report. Models can still be stoichiometrically consistent even when chemical formulas are not defined for each metabolite. Implementation: Check if each cobra.Metabolite has a non-empty "formula" attribute. This attribute is set by the parser if there is an fbc:chemicalFormula attribute for the corresponding species in the SBML.