Obo file in the current release (38) of Cellosaurus contains unescaped curly brackets, which is not compliant with obo format. This also causes an error when converting to owl using robot converter.
$ egrep -n '\{|\}' cellosaurus.obo
1229379:synonym: "L{beta}T2" RELATED []
1606194:comment: "Registration: International Depositary Authority, China Center for Type Culture Collection; CCTCC C2014222. Monoclonal antibody isotype: IgG1, kappa. Monoclonal antibody target: ChEBI; CHEBI:144925; 1-(4-methoxyphenyl)-2-{[4-(4-nitrophenyl)butan-2-yl]amino}ethanol (Phenylethylamine A)."
1645702:comment: "Group: Insect cell line. Characteristics: repo-Gal4 driving UAS-RasV12 and UAS-bratdsRNA (P{y[+t7.7] v[+t1.8]=TRiP.HMS01121}attP2)."
Obo file in the current release (38) of Cellosaurus contains unescaped curly brackets, which is not compliant with obo format. This also causes an error when converting to owl using robot converter.