Abstract 1. 1. The homoserine-containing phosphopeptides isolated from the cyanogen bromide cleavage of the methionine-containing phosphoproteins from duck and turkey phosvitin were dephosphorylated, cleaved with trypsin and resolved by Sephadex fractionation, paper electrophoresis and paper chromatography. Dilute acid hydrolysis products were also examined. 2. 2. Use of manual and automated Edman degradation methods, together with comparisons with peptides of known sequence isolated from hen phosvitin, afforded evidence for the amino acid sequence of a major portion of the methionine-containing phosphoproteins in duck and turkey phosvitins between residue positions 1 and 38. 3. 3. Sequence homologies for duck and turkey phosvitins in the regions examined are close to that of hen. All contain a number of blocks of recurrent phosphoserine residues and a serine-free ‘leader’.