Vaccine(3) Streptococcus pneumoniae(3) malaria(3) purification(2) Malaria vaccine(2) Ru5P(1) Merozoite surface protein-1(1) PspA(1) scalable(1) pppGpp(1) PurC(1) Protein Data Bank(1) protein production(1) S. pneumonia(1) DHBPS(1) Plasmodium falciparum generative cell specific 1 (GCS1)(1) immunization(1) REL(1) solubility(1) PCR(1) Granule lattice protein(1) PDB(1) protein expression(1) 3,4-dihydroxy-2-butanone-4-phosphate synthase of Streptococcus pneumonia(1) SpDHBPS(1) Salmonella(1) PsaA(1) synthesis(1) Purine biosynthesis(1) Dimethyl sulfoxide(1)