Abstract: There is disclosed a new calcium-regulated promoter to be used for increasing production of extracellular enzymes, or heterologous polypeptides, a recombinant vector that includes the DNA sequence of the promoter operatively linked to a DNA encoding said enzyme or polypeptide and a host organism transformed with the recombinant vector that includes the promoter operatively linked to the DNA encoding said enzyme or polypeptide. The present invention further relates to Streptomyces expression systems and methods for expressing foreign DNA sequences in Streptomyces and for secreting to the surrounding medium polypeptides and proteins coded for by those foreign DNA sequences.

Abstract: Administration of a Growth Hormone Releasing factor (GRF) at effective dosage levels improves the mental function of attention or short term memory in a subject in need of the treatment. The method of treating comprises the administration to the subject of an effective mental function improving amount of a Growth Hormone Releasing Factor.

Abstract: The administration of Somatostatin and growth hormone releasing factor at useful dosage levels alleviates the symptoms of various neuropsychiatric disorders.Growth hormone and neuropsychiatric responses to the administration of growth hormone releasing factor to mammals indicate its usefulness as an antemortem marker for senile dementia of the Alzheimer's type.