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New parameterizations are derived for the quark and gluon distributions, accounting for the massive Wilson coefficient for the charm quarks, and the value of $\\alpha_s(M_z^2)$ is determined with correlated errors. We obtain $\\alpha_s^{\\rm NLO}(M_Z^2)= 0.1132 {array}{l} + 0.0056 -0.0095 {array}$. Limits on potential higher twist contributions to the structure function $g_1(x,Q^2)$ are derived. 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New parameterizations are derived for the quark and gluon distributions, accounting for the massive Wilson coefficient for the charm quarks, and the value of $\\alpha_s(M_z^2)$ is determined with correlated errors. We obtain $\\alpha_s^{\\rm NLO}(M_Z^2)= 0.1132 {array}{l} + 0.0056 -0.0095 {array}$. Limits on potential higher twist contributions to the structure function $g_1(x,Q^2)$ are derived. 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