The first Ramachandran plot was calculated just after the first protein structure at atomic resolution was determined (myoglobin, in 1960), although the conclusions were based on small-molecule crystallography of short peptides. Now, many decades later, there are tens of thousands of high-resolution protein structures determined by X-ray crystallography and deposited in the Protein Data Bank (PDB). Many studies have taken advantage of this data to produce more detailed and accurate φ,ψ plots (e.g., Morris "et al." 1992; Kleywegt & Jones 1996; Hooft "et al." 1997; Hovmöller "et al." 2002; Lovell "et al." 2003; Anderson "et al." 2005". Ting "et al." 2010).