Stepwise Model Path 
Analysis of Deviance Table
Initial Model:
topt ~ (Ala + Arg + Asn + Asp + Cys + Gln + Glu + Gly + His +
Ile + Leu + Lys + Met + Phe + Pro + Ser + Thr + Tyr + Val) *
(Ala + Arg + Asn + Asp + Cys + Gln + Glu + Gly + His + Ile +
Leu + Lys + Met + Phe + Pro + Ser + Thr + Tyr + Val) -
1
Final Model:
topt ~ Ala + Arg + Asn + Asp + Cys + Gln + Glu + Gly + His +
Ile + Leu + Lys + Met + Phe + Pro + Ser + Thr + Tyr + Val +
Ala:Arg + Ala:Cys + Ala:Gln + Ala:Glu + Ala:Leu + Ala:Lys +
Ala:Phe + Ala:Pro + Ala:Ser + Ala:Thr + Ala:Tyr + Ala:Val +
Arg:Asn + Arg:Gln + Arg:Glu + Arg:Gly + Arg:Phe + Arg:Pro +
Arg:Ser + Arg:Thr + Asn:Asp + Asn:Cys + Asn:Gln + Asn:Glu +
Asn:Gly + Asn:His + Asn:Leu + Asn:Met + Asn:Ser + Asn:Tyr +
Asn:Val + Asp:Cys + Asp:Glu + Asp:Gly + Asp:His + Asp:Ile +
Asp:Leu + Asp:Lys + Asp:Met + Asp:Pro + Asp:Ser + Asp:Thr +
Asp:Tyr + Asp:Val + Cys:Glu + Cys:Gly + Cys:Leu + Cys:Lys +
Cys:Met + Cys:Pro + Cys:Ser + Cys:Val + Gln:Gly + Gln:His +
Gln:Lys + Gln:Phe + Gln:Pro + Gln:Ser + Gln:Tyr + Gln:Val +
Glu:Gly + Glu:His + Glu:Ile + Glu:Leu + Glu:Lys + Glu:Phe +
Glu:Thr + Gly:His + Gly:Ile + Gly:Leu + Gly:Lys + Gly:Phe +
Gly:Pro + Gly:Tyr + Gly:Val + His:Ile + His:Leu + His:Lys +
His:Phe + His:Tyr + His:Val + Ile:Leu + Ile:Lys + Ile:Met +
Ile:Phe + Ile:Pro + Ile:Ser + Ile:Tyr + Leu:Lys + Leu:Met +
Leu:Phe + Leu:Pro + Leu:Thr + Leu:Val + Lys:Met + Lys:Phe +
Lys:Pro + Lys:Ser + Lys:Thr + Lys:Tyr + Lys:Val + Met:Pro +
Met:Ser + Met:Thr + Met:Val + Phe:Pro + Phe:Ser + Phe:Thr +
Phe:Tyr + Phe:Val + Pro:Ser + Pro:Thr + Pro:Tyr + Ser:Thr +
Ser:Tyr - 1