. "Any process that stops, prevents or reduces the frequency, rate or extent of tetrapyrrole biosynthetic process from glycine and succinyl-CoA." . . . . . . "negative regulation of tetrapyrrole biosynthetic process from glycine and succinyl-CoA" . "down regulation of tetrapyrrole anabolism from glycine and succinyl-CoA" . "down regulation of tetrapyrrole biosynthesis from glycine and succinyl-CoA" . "down regulation of tetrapyrrole biosynthetic process from glycine and succinyl-CoA" . "down regulation of tetrapyrrole formation from glycine and succinyl-CoA" . "down regulation of tetrapyrrole synthesis from glycine and succinyl-CoA" . "down-regulation of tetrapyrrole anabolism from glycine and succinyl-CoA" . "down-regulation of tetrapyrrole biosynthesis from glycine and succinyl-CoA" . "down-regulation of tetrapyrrole biosynthetic process from glycine and succinyl-CoA" . "down-regulation of tetrapyrrole formation from glycine and succinyl-CoA" . "down-regulation of tetrapyrrole synthesis from glycine and succinyl-CoA" . "downregulation of tetrapyrrole anabolism from glycine and succinyl-CoA" . "downregulation of tetrapyrrole biosynthesis from glycine and succinyl-CoA" . "downregulation of tetrapyrrole biosynthetic process from glycine and succinyl-CoA" . "downregulation of tetrapyrrole formation from glycine and succinyl-CoA" . "downregulation of tetrapyrrole synthesis from glycine and succinyl-CoA" . "inhibition of tetrapyrrole anabolism from glycine and succinyl-CoA" . "inhibition of tetrapyrrole biosynthesis from glycine and succinyl-CoA" . "inhibition of tetrapyrrole biosynthetic process from glycine and succinyl-CoA" . "inhibition of tetrapyrrole formation from glycine and succinyl-CoA" . "inhibition of tetrapyrrole synthesis from glycine and succinyl-CoA" . "negative regulation of tetrapyrrole anabolism from glycine and succinyl-CoA" . "negative regulation of tetrapyrrole biosynthesis from glycine and succinyl-CoA" . "negative regulation of tetrapyrrole formation from glycine and succinyl-CoA" . "negative regulation of tetrapyrrole synthesis from glycine and succinyl-CoA" . .