– Precursor of the egg-yolk proteins that are sources of nutrients during early development of oviparous organisms.; Phosvitin is believed to be of importance in sequestering calcium, iron and other cations for the developing embryo. Vitellogenin-1 Protein, Chicken, Recombinant (His) is expressed in E. coli expression system with N-6xHis tag. The predicted molecular weight is 72.4 kDa and the accession number is P87498.